Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2323d1ec5e6c5d5…

MALICIOUS

PDF

69.9 KB Created: 2021-05-28 17:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e707c8a1312d84a0d7f9f96305ee3319 SHA-1: 55426cb68f24a84e856c24ad8c50540bc5e623a6 SHA-256: d2323d1ec5e6c5d5e7393e921818228f8bcd8cd669ee96838cb29b8b6615d39f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing a link farm hosted on multiple compromised websites, aiming to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/06969ba174e33382a202257e484ec7ed/2485560701.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/6db70ad71416ff06d6c2fc3a0d157a7c/wukokis.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac68baa295---bobufega.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6342388b4---46990091280.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160907eca294ba---fafavogolimizenevajof.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/t5bannlprgqp60orvun095jl8l/guxagi.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4d99a45c---71605202327.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5b2fa7193---46632416072.pdf
    • http://buergerforum-tirol.at/file/misawegewuxanuzuxo.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080dfd585e5c---lepujawefu.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/1437c6dbf57dbcbaf27264562be395cc/dukojuzusulid.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8da8d83bf57487d0f050cc6b46eed841/sosolabagaletekafesuwo.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/c1da41aacac0874428f3ff4795ed6b5a/81275832303.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982af87dfb3---7374196469.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=irregular+past+tense+verbs+worksheet+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d25e.bin
44e9db27449465b5ecbf4b064e9b668d564cf419c54c49640d994bed3c5a4d17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD25E 5596 bytes
font_01_sfnt_off0000e575.bin
72bc2feef43be1e828791c8237ca954c1a9510b365400a1b656c4387aba1a028		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 10308 bytes

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