Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5ba04bc490582c…

MALICIOUS

PDF

87.7 KB Created: 2021-08-05 06:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 32328b02f81c20a7d7444b6c126e522a SHA-1: 689c1b2ed5c32da78aea4835ee0eb75ef585f93b SHA-256: 7c5ba04bc490582ca7ebfb3774c6dd888ee4de9cdd7d753c3de1971d14cebf4a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to obscure the final destination. The presence of these links and the overall structure align with a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89dec037d---58243624840.pdf In PDF document text
    • http://samwha.com/upload/userfiles/file/danobosudipe.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/nupejoruvanu.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16083d1ddc16f6---revoxaj.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/16086937902.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/tutek.pdfIn PDF document text
    • https://pellevah.com/upload/files/pabopu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/k689ikmlqc1v49qk4edc1vhq07/nepudiwasomi.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/69iv600d2vem91m56ulqm6clt4/mojuwowoxofovi.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d2c423a11d8d954cf9d3dc76b43251ce/nijituparojuvitedarara.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1keu69v8ors7vnffjb1ld88ccq/pifopefiwomatisamuje.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/gudipi.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cddabe2c0af---masikijowesixutadizota.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/9408979cc62182a78522ac3abc84cbb4/zifabepirapobibajiz.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/41356628965.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e4045b25d---4012499567.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/vewet.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e634db213a9---16703691453.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/wulimewejomatilokukom.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/80655059472.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffed460595---zemipuvakujoniromojinukuk.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd92930f1d3---28891349151.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/48400047704.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/danitubitawulojisuxa.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a151d65505c143ecdc4ffa63e2f70f98/80843878078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=namibia+map+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_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 17368 bytes
SHA-256: 1f9a44e04207ec521e660dfc0f15daf9941f54643c700674f454ffcb1f048557
font_02_sfnt_off00013994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13994 10008 bytes
SHA-256: 4144b7e6827b861a23cfaf97be7fba482d23ec1f0436aabb6ac1a18d7f40b07f

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