Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fef85aa55161e8f…

MALICIOUS

PDF

90.5 KB Created: 2021-07-06 00:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 95f3dc4dbc4d47f5d8f217c3414837b5 SHA-1: 1a5d1251c1e018fdd2d9202643fc813c6137e15b SHA-256: 5fef85aa55161e8f845680b7e51cdb9752b3e134470558385166257fded2f5a9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm and a social engineering attack. The 'SE_CLICKFIX' heuristic specifically points to instructions designed to bypass macro restrictions by prompting the user to execute commands, likely to download and run a second-stage payload. The presence of numerous URLs, many hosted on compromised CMS uploads or disposable domains, further supports a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://halongbaycruises.org/upload/files/fepepefepanepikugi.pdf In PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a49f9180110---31156068955.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/gejerudodexasaxiwovigisax.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rmq39pd30v1dk6v5jrqoh21os3/95968255007.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797bdb3ffd---49039529406.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c045af37ec1---rukijevokobutesonowaw.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/79909878161.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/lidosibuferawajeka.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/berudotonig.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/41oc990utne3snsnrva70vrlqe/80094163603.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/7umo3av2hres2p44f9ghnnh7qe/ladaxufatenolivotunabered.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/6127362321.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/petebafok.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/319a3adc2031896755fa3f5e7a57391e/duvog.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/272mmujhhhpfc9e144kcndko0b/1798661675.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/b490ml65b1ah6jc4h2vbpbmqf4/84934551835.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9b9cd97297e69a58ab0f6facc9b0284f/zadejuruvebirapu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096710fe7fbf---tadupurebopewufod.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/6ffc77110d5e7d19dc0b91d3e9982858/36158028471.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/af2787e2cfc382c3e5b0f6c1e85c0f85/xemafogafalijalofuw.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad473e090d---84628900913.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/43753550517.pdfIn PDF document text
    • http://debden.org/userfiles/file/rogure.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/94c48b96b50b7b00fb724de2f6d2b5c2/vusofiwajisek.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8eb0c52eb---68885414507.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d71884cbd---vapizarofagikinib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gang+beasts+controls+xbox+onePDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 17928 bytes
SHA-256: 7adbd633d620d783225053637d8c4938ea3a17c185c8220a2b71f1703156b3df
font_01_sfnt_off00012c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001444e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444E 10592 bytes
SHA-256: 2d8cb00c13ffa8069502798de4309ab262446f8f268938aeb19c7b9262c8b844

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