Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e73071a99e98a3…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 17:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee2d81f85c17567fdb979b7d263e2d7e SHA-1: 327699389cf197b4be73e8a19ebfbd2fb5eaf344 SHA-256: a2e73071a99e98a3b2a8aeb0d0953cfbf6ef8afe21b4f2956fd0dbcbd36a9d58
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable hosting and compromised CMS uploads, indicating a link farm designed to obscure the ultimate destination. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pretext, where the user is prompted to call a number. While no scripts were directly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://soluzionebenessere.eu/userfiles/files/widomogezidixadal.pdf In PDF document text
    • https://recapress.com/ckfinder/userfiles/files/nufisadanemanevapudixo.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/likoliwa.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/tejiwesur.pdfIn PDF document text
    • http://bienbao.net/uploads/files/virosinepivonanukuba.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/6980734187.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/19067015059.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/domul.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/31874350687.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/pugekuvamavomubalewemofe.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/45875081466.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/lobijapemamugagewewutu.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/83460645186.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613732f4bfa61---vixuzoxazodejerurogebifa.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/47179970188.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/27366621004.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1ec93fe9---juwotonamaxujawu.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/67091530676.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161344085dc75a---loragugenuv.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/20451078514.pdfIn PDF document text
    • http://happy-land.hu/editor_up/nowudiga.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/90d974bbe6909ae96b8782bd919bb898/99805379993.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/dubanovisafox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+daten+wiederherstellen+nach+factory+resetPDF 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_off0000d212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA24 18700 bytes
SHA-256: ee67e4ae66eea2f42d31115e792ac0b74dbdce62f256e3ebe183dbbf393e8178
font_02_sfnt_off00011905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11905 10756 bytes
SHA-256: 27d510a07a5609fc2ac906c44448bfb87e42407f8e9ede1f60aa101492e9274f

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