Malicious PDF — malware analysis report

Static analysis result for SHA-256 18754a1f2caa401e…

MALICIOUS

PDF

92.2 KB Created: 2021-06-27 02:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 50367e53116ceb4d936dfb61e6e4053c SHA-1: 2762ff8a0ba08c5b862d41e28808f9bf64f5eacc SHA-256: 18754a1f2caa401e4a4620371681872f736fd0e1704c2546024431d1c1304db2
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a social engineering attack, specifically a 'ClickFix' lure, by instructing the user to execute commands. The embedded URLs and the ML classifier strongly indicate malicious intent, likely to download and execute a second-stage payload. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=windows+10+check+marks+on+desktop+icons PDF link annotation
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160717b3a88e8c---46930064864.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/kalavigu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4478653b61---doronigi.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b75d0c533aa---ruvikovul.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732c579bf63---gerazikezuxumetakeruralar.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/33c7df4f80e840faebca66369480b6b6/fanevenaworepaporo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2c1783346195ecca7b5770191f483f69/mafupumomijivotojuxiruw.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/a95d87781784bcea16206e51dfc2f5d6/japuriluzovanuj.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608d63a74e2ff---12370886401.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086f43ab8817---58268529928.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/87483029006.pdfIn PDF document text
    • https://parfumzone.ro/files/file/zomegapizidifoj.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/76970412433.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070109887093---xilokelu.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/v9a3mu5lv0qgv2ualrh8tu6s93/rimijiwajijad.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7134b5f7fe---tisonebaritivoru.pdfIn PDF document text
    • https://motacademy.it/file/12470932525.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ad84bbb9399f1bacc6f91494c6668ecc/54567036630.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c93849c7188---jevupevuxesugamolu.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3680c3b4c---46470967169.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a0f7858de9f18c635bbff5c06d48d9d2/73772648351.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/2344eb98346c337cd4345213b98c15f0/zapegaxovibukopipe.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/vpgip5u6ljd0a0mrmaudo867s0/29469662736.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/telokigazisibebitep.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/dilonawemivanoledafika.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 1728 bytes
SHA-256: 164b17f13be751c428b8a7847bfef4401e4c17c2bf41cfc2fceec83f5d69c6ba
font_01_sfnt_off000100c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 18200 bytes
SHA-256: e507a9107bd69f408f8b52aa6427ed7c31b99fe7a37b351c6974650dc46f2bc7
font_02_sfnt_off000130ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AD 11080 bytes
SHA-256: 59e9e1976fce99f5d1329ed6584ed844a44d2141b3da3d335b3ac0c34fe15eff
font_03_sfnt_off00014a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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