Malicious PDF — malware analysis report

Static analysis result for SHA-256 01edb4d4fe281ab0…

MALICIOUS

PDF

87.5 KB Created: 2021-07-05 22:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f7aa4cf2dab5ca55b9a3656a87bc1e3 SHA-1: 0677e2a204dbeb75c941ce0fbdab5928b7095664 SHA-256: 01edb4d4fe281ab093baef3914d504e670d7955a5db7a44bbcd2650166591c91
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm or SEO poisoning campaign. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a malicious intent to redirect users. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=which+direction+is+air+flow+for+furnace+filter PDF link annotation
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d41b86b9---kivabe.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a296bb721---gaxalexowefegikiki.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/0dfa84f1fb28773bf964dc6c81354d1e/20305059189.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2370aa030---97606868153.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6rkg04m1a60b4g9jem810rcdcl/lipenavededebibuvimimo.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/fisibibafiruzufimilabek.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/gizupir.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e802ac2a0972af53f9b4922dff4d31b5/32155604425.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec4d32958---povulujejis.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/rosumukorojiziwamaxejuvef.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/selajagoxesowi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8bd86a74d45c9cc5b0ac030a4eebb214/mopipikiku.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/61276542149.pdfIn PDF document text
    • http://geose.ru/userfiles/file/39995855363.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/54495461074.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e688c59d07e206d2961d885662c43113/tojog.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874878a60b2---46275109952.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c074c268f74---banipalakis.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/lupij.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f334a6f0869007cb3e0ea2ccfb1dfac6/ganumerese.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9429a17b8f---vewelota.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ffcf757f80ecbd9fc1c55d2fd22b1ff6/18102866902.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f30a86bbdca87e5c3c3c7d54d3abed11/52090525789.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A99 10752 bytes
SHA-256: 741d9738d303107d66d6722ff579f8978afd6b3c31ef4d3784f3a958fb90ce68
font_02_sfnt_off0001235a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235A 17436 bytes
SHA-256: 6455f8680a9fc69629a8e71fd2545df18a139d85cd95ee0c2f936c9a160c8ea8