Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfd6ca8041a69c0…

MALICIOUS

PDF

83.4 KB Created: 2021-08-19 21:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb967fee43a37578f1c4b8303243d237 SHA-1: 825b41b9abb1df7eb5dbc550e02725c490d04c32 SHA-256: 0bfd6ca8041a69c0de023d64607b5f750e853573123481805074cff6d13e4e14
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sciattella.net/images/file/13770395779.pdf In PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/pe56db2m6nfr50s7ur5tlhunpr/42171910601.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ce084e8f7---59798385804.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/dadososa.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/96598891897.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/8468130291.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/remazuritujakobegekolo.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/wejadixevivaxafulugomesi.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/baxejesofininiragajive.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/2569363527.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c27cc89899a4e55751a47802d4e96f4f/82976001079.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/lakuxineremizabafemavig.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/af48dce7ee5016b9cc584718de9aa934/73328068072.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/bikupizugabovam.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/p79ckhs7qa6t1nnndeh41vu8av/54029727094.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/hav2s3obpdbjjm2f4qtmc7m5i0/degarojutuwirijufajiw.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/togewadilixekefozegobi.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/06/18/samubisisa.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2a920fcf2---gozegejugawa.pdfIn PDF document text
    • http://normel.org/files/upload/file/93840816181.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe4123de586---junem.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/87365242770.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/277d3656c087e9909e95345058f1f3f9/damafolawivivekiresoxagi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/a611eed20cacd241284927bbf029818b/gisutijixosajepozogawa.pdfIn PDF document text
    • http://trhs1966.com/clients/b/bb/bbabdd843433c1cf4d3e80624837507c/File/viwutulosepuwejemaxewemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=solucionario+fisica+quimica+3+eso+anayaPDF 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_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 19088 bytes
SHA-256: 7369ad6cd69141dc0bda07e42b7f26389c5b39fdc80d46f6a865e3aa3a259a73
font_02_sfnt_off0001242c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242C 11008 bytes
SHA-256: a896931650ed9cde07e8a79c2876ff66fa82b05d41299fe1e713fb561c002df3

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