Malicious PDF — malware analysis report

Static analysis result for SHA-256 465f343533966472…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 19:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f90951a919606b3132904a847208f25 SHA-1: ba2e0f15bc98f6618c5c1526256e4f30e8dbc836 SHA-256: 465f343533966472e17dbb853d68ecde7a981e3bf0aa4c790b8e103b8961fdd0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users, likely as part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/978aa1a10baf872964eaea2aec34b1d4/32434208401.pdf In PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/31734798844.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090420513873499.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/kujubaferavamof.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/13000394946.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/dukimolutefuluj.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cceceff7e---83770104629.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d7d9ffb40449c6388dc65abbbd37fe73/bepugowasexulemonuxilol.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/majuxe.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/75156027795.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/91004208050.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/6121878a417e2.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9edde910f2---tunejizekobedike.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/6759c6362f863deba693fd5996484649/fevobuxunubivejepo.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609431ef16fe1---79942217755.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/437573cdeef2f6d5adb69ff318389208/mexopixafulegonude.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/61628712227.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/fb7c9d85ba206a1a37ebf31eecbb542d/62853453967.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/13229031682.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/15316599458.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8b38c30879b99bc994f59e342c4e261b/masegafanil.pdfIn PDF document text
    • https://promise-land.com/upload/file/tuzopibizotoxujegedugemog.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/df549ad099fb1473d0202a0d46c65836/pinavimemoxobimomakugebon.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5be7ac06---7935131338.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/a3hf91aun9k4s8tvvf7pmnqrhn/tobamukijakegufena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+pdf+plan+takeoff+softwarePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC486 10556 bytes
SHA-256: 2fd70a08930f9bb93d38c9c767154b4b5f0327b645bb5ceb08ae024d0ece012f
font_01_sfnt_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 16076 bytes
SHA-256: 7ead4ccbc69d49755d246eb8322e28faaac365cf843751a9cd3c89dede2e013b
font_02_sfnt_off0001055c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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