Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9a79faaea7b457…

MALICIOUS

PDF

83.3 KB Created: 2021-08-31 04:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 04dd0ce8ebf577aaf7764c008383dcdc SHA-1: ed14c10390df8ac2b63439f60b62a61eb2a517e6 SHA-256: 3a9a79faaea7b457eb5c16df8f9c3c231d37f80041600fef567543942c2e4f1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs were found, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/uplcv?utm_term=will+grass+grow+in+clay+soil PDF link annotation
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/ced68e16448dd74c82ad9b3a60fde033/merajawulajowixojatotase.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/gemopubufidusepezoxasowex.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/20e2f4f747d023723de351c66a33071a/79943764780.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/592148473cb3d0a3215a732edf19ca22/texon.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/st8hcgdk8qkvegsempaiu1mt3s/49011629434.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kogosumotewifizupesumibu.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/99014504646.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/30ef0f1b1624ab6c5628393bd4c0e100/17226487934.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/102911725.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/31242742276.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b393e3410f1---83678399474.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/6751370867.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e13382aff---lamokabigijukosebuwijewe.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/b75a2f0316290e89aa48edd431ebf5ee/24647013869.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/zuwiwi.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160819ebfe3b8c---16110467278.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/4032100520.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/2p9t48kn2vfht0samiqlge5k53/zebaxikamarokoxotikaso.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/vameguju.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/tifekozi.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/30139849670.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/18347620254.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af9b25a7370---44026176836.pdfIn PDF document text
    • http://yepuco.com/uploads/files/49919657369.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 17268 bytes
SHA-256: b79adce2d9ee33620af3b7d4b1d62f4434e09bb46c531f924bcbbc0d84a325c5
font_02_sfnt_off00012725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 10368 bytes
SHA-256: 675c68f1704c8acebf38080d6be60c0dd77045e27072a572aa98f260e3617a61

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