Malicious PDF — malware analysis report

Static analysis result for SHA-256 b897775bfea401c8…

MALICIOUS

PDF

76.1 KB Created: 2021-07-03 20:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1839481d50b12aa25e75c26f27da9c68 SHA-1: 428cf1ffe7e8af17785b3e07f53ae46809e146db SHA-256: b897775bfea401c8cc4c413504e98184409ef1f713dedfcffc8ae5330dfafc8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://queure.ru/uplcv?utm_term=filipino+english+dictionary+pdf+free+download+link
    • https://seerupit.dk/assens/file/89231035879.pdf
    • http://hogan1973.com/clients/d/d4/d4eda5e2427b34f3a15374adde9a77da/File/1163594374.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa87da08615---xewogisepomit.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ac188dfb34aab750c10cfa1a26121c29/87273986020.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3908fcb64e---wabaga.pdf
    • http://airconbank.com/upload/fckeditor/file/mowojedevajamufomaw.pdf
    • http://mylodge-naoshima.com/43307510781.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/09bee65fd829f3f2680b307040b487d2/pufenu.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/e39affd2630e703f34fd1d2a7eb3aac8/seduxamozarogaguzomise.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c877968dc4---40222495459.pdf
    • https://cremyco.com/app/webroot/docs/file/19643450903.pdf
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/wuvipoboxeso.pdf
    • http://quangcaosms.org/media/ftp/file/36096968119.pdf
    • https://atlastoursntravels.com/userfiles/file/65668280932.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb48a2db16---30236005987.pdf
    • http://lacasedescaraibes.fr/file/lajebibutelafopupila.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f2930307c023f30e54d44875fbd5ae78/xifividujegukenalitazu.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/41019974924.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab6b777120---jaxuvopazufeposizi.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/72e57tobk0d14s82d1g09970mu/lotavisof.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ur0m72gjtooh9bopd5plcm9el4/fewakog.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1429d16dda---gipavegegazi.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609873ee6dc5a---61211324578.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16088ebdb53688---pomoxovarigixinixomif.pdf
    • http://esangsok.com/upfile/files/33115982610.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607d93806c983---guxepo.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5c9.bin
75f40d2a571539c037b99efa98984bf7aa85e0343b0d1bbe8be0f1441408cee8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C9 11168 bytes
font_01_sfnt_off0000dfae.bin
655f3eff4c083d06cd18f1184b10ad7a34f0a381a2a82558fed73e2a9d66dc4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAE 16440 bytes
font_02_sfnt_off00010a64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 16792 bytes