Malicious PDF — malware analysis report

Static analysis result for SHA-256 10de5db2088e0a3d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 04:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c5dc0b867b7464e4ea284023e6c0aa2 SHA-1: 07d9dd9eea1006e6fe0969771a03584334844513 SHA-256: 10de5db2088e0a3dab65c01f8d60d2428aa9709610c049fdbc827b07afd3b1dc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing lure. It presents itself as a document that prompts the user to call a phone number, likely for a fraudulent purpose such as a fake subscription renewal or a tech support scam. The document contains numerous links to potentially compromised websites, suggesting it may be part of a larger phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • 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://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/0d9764af556572d9d19e0ef2bd7b5cee/89206979769.pdf In PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/bab12aa0249ab144846f04136777478c/tutatulon.pdfIn PDF document text
    • https://hirurgija.me//files/fumasuzeduj.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/0968a823f67753f508e39ef5a1e8f40f/visefafedajijosapopekilo.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f7677ed33---21720530637.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6581626a86---giwuridapunaxaxibaki.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/bokefele.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/wimakufakagoseveboxov.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/fitan.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef7175f322---25254228461.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/28080949009.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef6a712f4---45589050389.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/92051397448.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/volewivulasipa.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/479be061fb70b29dbbd497782dbd817e/munexukawiduj.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/32366626277.pdfIn PDF document text
    • http://sclifeguards.com/clients/16854/File/59313713252.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/19060327584.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8956e88e976ca15c526a14f1a713cb40/70187088552.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160aad7352c5be---xonalobovogime.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/nunogabiguwudemubipefe.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/t2ap6m1esk3ovsd2jn1tj6m395/fogaluronon.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e131c169a22---94818962208.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/72484199392.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084c6827e449---vokinazazaxoxoridopiwu.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/dutotogazewefikapoligu.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/81c84a46d5d646d417c8933b45f8d25b/59154615469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=alimentos+que+contienen+potasio+pdfPDF 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_off0000dca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 10908 bytes
SHA-256: 1c1799439e899e20967f720ca43f9aa3bea438440dad363f0a3b5313c40f2b07
font_01_sfnt_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 19456 bytes
SHA-256: 5f0d9c278e911b09f507863b2a1eb1f641e8f5f2116ca6d0d88eb750450a3465
font_02_sfnt_off000126a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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