Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabb8bf700e619ae…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 05:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93c3b367b8c4033a12a429aeaf902b40 SHA-1: e70625fa613f2343c42be067b990068c14455806 SHA-256: aabb8bf700e619aef3710516a70278b1e693ecb7fa62884e98c2cf6ee1394a91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users by directing them to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee8fecf005---refulenuwe.pdf In PDF document text
    • http://unsersohn.ch/images/file/fujivepenumusawaxajil.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/20244163868.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/fujikunerulud.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7d14d13815789a2a986e1bd479af8cd0/21920610105.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/rewoluguzeriraresidogum.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/cb0ab62c21904aad23076bb16e14e6c1/63930738870.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6e92e8299---gajutaluku.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/buzuxelikafanidaxim.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff2d3dc603---safefidomorufibup.pdfIn PDF document text
    • http://cudicio.it/images/file/dexivarobozelakofivosoxo.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/63e8280018bb47c28d669566cfc91f2f/81646316189.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/74628344428.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/jelenovukezugiwofo.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/depipusidezokiguvalo.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/favoxuvoni.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/jufuzagapibi.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/81602596383.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39207201469.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070971846921---30928957406.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa74a64416---suzul.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/talutiwekafezubeto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=acd-2100+user+manualPDF 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_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 18068 bytes
SHA-256: 9c8574fddad6875e9ad037aa57fa173bf486bc34898512470023b9388003e070
font_02_sfnt_off00012c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C01 10628 bytes
SHA-256: bf90418935257d0a7756aff2e00f6b5dfc038823f01b12252bc135c48dab12cd

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