Malicious PDF — malware analysis report

Static analysis result for SHA-256 777db61ed34d9bf1…

MALICIOUS

PDF

75.4 KB Created: 2021-07-13 23:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4f19362e56f5ae3cf7b311a904e5809e SHA-1: 1e8bd19a9de8122cf5fa8fe27bf9bebb9d14259b SHA-256: 777db61ed34d9bf1cdda30ce244e96a8fd5fa348cdebb29ee96b0ebf7ba6c067
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The embedded URLs are likely part of this distribution or phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870546b5082---novokama.pdf In PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f87eda48608bb6648f1a3e7a57854d84/5362892529.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/lurokusofakala.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/wukelogaruliwulojimebago.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/75754667864.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a975888dcbe---xasosedaxugisagerilazedat.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ha73n2mbpcgc0ac3g29bslp004/53324884009.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/luxovedanaxarufaxizurej.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/8e53e8fe5263c93cbed88452b49b3666/77188714627.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84c94032e7---panosabudexux.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cebc65b4028---sibefirox.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607deeac96156---2820858473.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd188123c9b---3358040970.pdfIn PDF document text
    • http://benthanhfarm.com/images/uploads/files/55771088420.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/tcns3dl7e4f8d9r6vf5cj0s5ij/jumivitenerowu.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/568572d2b006e52afb79144b47b00d36/27541415128.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/rapinumuf.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/fh5cr8jgrrq7ejjaehmf46cve2/zegokimubog.pdfIn PDF document text
    • http://industrialdevices.in/uploads/86621588093.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/pobalesujizukazagov.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e39d2954547---70101828869.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/46403839775.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/pugejofoworadisekalevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fire+and+ice+recessPDF 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_off0000c562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC562 16720 bytes
SHA-256: c4873ae6102fff18b47c3d9cf2b283957c1813c16405d4901cf5acc43844ed4b
font_01_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 10076 bytes
SHA-256: b57fb5b41f02723c5e85d778ecfa9bed32ef7611c52b17dad9dd0705f0644ace

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