Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6950df7e68565b9…

MALICIOUS

PDF

86.8 KB Created: 2021-09-02 15:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1baad85fb06ab4f4f2305515212db175 SHA-1: 47c1403c8db01bf4a976bb0709e39ce121f28a36 SHA-256: b6950df7e68565b9bb111c61a88828f7ae441aaaffd010cf629b5fe90b2d2588
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the link farm and potential phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://darshanam.com/ckfinder/userfiles/files/dubebenabesikob.pdf In PDF document text
    • http://afslab.asia/upload/files/13792194475.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/potejokaputo.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0609e4b4f1---xusunuvegebeg.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160929309c886c---37316116192.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8e67eca0a62c8532851c2ce11d021123/12441174755.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/rerowolibiwowipowed.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/jumujawazebat.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/orpdprln0tafoj2g2ii30n8tg4/34752838504.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/sjvu1vl0kneeidtap04qh0fojv/24800108804.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/56caee9dbd21de8302abb535edbc4b77/66837248703.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/puxomabenedigiwasu.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/dufavudezukejimipe.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///vavimiwosuvatu.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/39403765788.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/valavewofal.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/60468539694.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc88469331f---wezamewubipekuzofubeledat.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/88557003517.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/678a47d485e87b61513c3d73d45a51dc/29096151534.pdfIn PDF document text
    • http://broomfield82.com/clients/4/48/489ff1710263d1ca947d92387d56c809/File/wamaf.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/vijidisoxowedugal.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/nexawuritimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=marketing+research+pdf+nounPDF 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_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 17016 bytes
SHA-256: 8974da8e3b96c4d179c0abaa30837aefce4ef9993b7a935fd37dc74ff44dfdc5
font_01_sfnt_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 11036 bytes
SHA-256: b429ec72e492c8b4bdebc40d6fc1122b989e3958c3a231400aee1c8a333315bd
font_02_sfnt_off0001352b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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