Malicious PDF — malware analysis report

Static analysis result for SHA-256 1385f652a0eb110f…

MALICIOUS

PDF

127.4 KB Created: 2021-07-22 13:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: facfaea6d00b3e962b0fa8632b378e29 SHA-1: d86246430ac913745c5fb3738715c7051222cfb1 SHA-256: 1385f652a0eb110fd77bb51a42771d9aea72520e9f1922abbb6cd56d1f6eee6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised CMS uploads and disposable domains. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings strongly suggest malicious intent through redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://www.alex-vasilkov.ru/images/wisdom/file/bidifupaja.pdf In PDF document text
    • http://afghansolar.com/userfiles/file/80485244650.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/12830141594.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/801383542.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a351db4a9bd---68657314663.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a08bcc392a---dugofaxugovukubev.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ded9a0b6ae95f3bec2e3a1cb0008c603/22310968903.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/96557550958.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea2eb974b2---38317445119.pdfIn PDF document text
    • https://naoshima-habitant.com/52651102829.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/fenilenezakokomut.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac11e7d2a65---23480263626.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/zebenuwuxiwiluxusiginavav.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/6c9f61026e912f9dadb730e509b0554a/mafuwe.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210603_A47226434BA82677.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/37127eae767aa26ac88a9b16225d7e7c/33662320648.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/nobeberodakoraxufoduf.pdfIn PDF document text
    • https://kede.org/userfiles/file/3395692871.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///fogudali.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de8743b73c---lazigodebopolisuwim.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/vulobebogomanebowov.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/52604042286.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/adfe1aafddd07de1ba0e9775aea044b2/8254273442.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ba04db4e9d7c02fb7af99106c09bf4fa/10499796848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=reversible+in+thermodynamicsPDF 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

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_off00018e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E16 11000 bytes
SHA-256: 7c0045a628ff65740d2bd9a55c8d1fad5b9a1bb90ffe1ec206a07b332358972f
font_01_sfnt_off0001a775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A775 17856 bytes
SHA-256: a9a8a314cbe8a572066af13cb584a617de82fcc9a6835f75dc810c3328291883
font_02_sfnt_off0001d6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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