Malicious PDF — malware analysis report

Static analysis result for SHA-256 541883d8877ecdb8…

MALICIOUS

PDF

85.3 KB Created: 2021-06-27 06:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d40d4c3de9b751d3fb1a729a2fe718c SHA-1: 8d411da1f916ee90d366e7b502ef1493af7b79a3 SHA-256: 541883d8877ecdb8f72263c70e0dc9498eb811c9b50ef3dee156c0ceb5d49664
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. The PDF structure and embedded URLs are indicative of a spearphishing attachment, likely leading users to malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=how+to+cook+shredded+squash
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/bv2v9kgqhp3et0hsf6qoqs8mp2/36932387114.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a7832553bc32be785f2f0e81a65bd0e7/lunomubegulapoxav.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a71234f16---85170490045.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ff14a99d3---nanejiso.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/pkqi8bblalck4jfom0h04pklhb/76424126191.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/96279840164.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf34217205---44277565632.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706e2728f3e---balisa.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad59f180b6---91796736115.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a23286b119cfbf0f4638a2bb032888f0/domavetusiba.pdf
    • http://miamiokclassof65.com/clients/d/db/dbefc63a503cf3d3a4f9fb61678ecc08/File/67528656938.pdf
    • http://tipsclubcr.com/campannas/file/73561348298.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1262daae144f3a967c2d6e4084b8062c/tuzominozutirinigo.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762b9038d45---62401891134.pdf
    • http://libertyquad72.fr/userfiles/file/76586412905.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/289fa6669b08b650cb94302b6cc851d4/didixajile.pdf
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/69946662121.pdf
    • https://badrivishal.com/media/nisulavonavodofapaxalemo.pdf
    • http://dulichtantai.com/files/uploaded/files/29379577207.pdf
    • http://sevimticaret.net/userfiles/file/zewipepewowularogevuzofod.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bgok1q88qou7qkf8u0vlf6j872/58152123865.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d17caae201bcad7c95247c1188f25b67/7530208985.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a39eb254e---44284097736.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70ca632df0---mubejatob.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084ad653686c---revevibe.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_off0000eb5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 16792 bytes
font_01_sfnt_off00010371.bin
625e513da35b39eea877f8c88400088db9d33f162cbd0fdfdf4010b90d86cd88
pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 16996 bytes
font_02_sfnt_off00012f8d.bin
cc69c67183ef18759a15771d715a444420a28002f82cc964934e3690c8c35731
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8D 10640 bytes