Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff8aa7b322537d8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 05:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6abf3926d0aacd3786704bc0fbeb6ae4 SHA-1: 0f773f3f4038c28eb67258dd051eb5495191a8f7 SHA-256: 7ff8aa7b322537d8f615793190aa9c34d5d9cc5a3b716c2b52211e1b23611362
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=passion+and+fashion PDF link annotation
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9294973e6d---tobutovi.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832aa3221f1---7908307787.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/954967103.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/batikifaxapujemepum.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/60537236802.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/dofovejila.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/kqvv32t6cibpum0i95inb9di63/nekevininojojoziwezif.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8de77adc6---lisanitar.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/89432579345.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuxujabutafazi.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/cc6bdd0ca586ed1d558c5c48a24bdf50/24434311968.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/nelinilavesawi.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/34406804520.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75654a35dd---zaxagifapapi.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1nj3dfgdmagkn3vh8bn6809i92/71746951974.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/60617856598.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/58880494197.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608255910e68b---25425468904.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/31063754171.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/5dapjpg4er24d7bq74c5n9loa6/miwapotowasikoxes.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kizavufisevoketilim.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/37206094423.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 17912 bytes
SHA-256: 3d5762d3c907d86d036eba93c50d3c5feb062f3d4ddb1c690f78ef0801f72e6e
font_01_sfnt_off00010e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12687 10076 bytes
SHA-256: 09e2d9fed2d2e66912a9c6570bc27a2520652905bf71303dcc1ccd655ef65ee1

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