Malicious PDF — malware analysis report

Static analysis result for SHA-256 904085a1297a2863…

MALICIOUS

PDF

86.6 KB Created: 2021-09-06 06:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41a4a10a62eacc0417a2bf9f56ac59b6 SHA-1: 6213dd2638882a6fc558c7ad496402e46ec145a5 SHA-256: 904085a1297a286305a3f93bbca063247e717b6645bc47df2f276c034ff2d703
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to domains that appear to be compromised or used for hosting malicious files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate that this file is designed to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection further support its malicious nature.

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://hondasushi.com/uploads/files/romifeminopekab.pdf In PDF document text
    • http://shopcode.ru/uploads/file/3855605692.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/70953662935.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087595b8fa79---revosefu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/360fc7121f44e70556f6a50ab37a74f3/47742673700.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb307f901d7---rixezenex.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/91b7e6ae19898e826c40da3ce78cb613/830103844.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/l68cv1ad48j657hv8knnopf046/12023565491.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/57466396662.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/7cc4ksgcbv6u8bhonspv4bu05e/69192095527.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab0689cc06---3110033898.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/95734117726.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/xonugurikelo.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/82779543850.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb31e85fcfd---xejopewafefovagularep.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/farewidivexesibasim.pdfIn PDF document text
    • http://atek-ent.com/upload/file/vemokituvolipowova.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/29794876010.pdfIn PDF document text
    • https://maturana.cl/upload/file/32401676283.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/20826471825.pdfIn PDF document text
    • http://aven.su/userfiles/file/206988080.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/35561076367.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/76196340587.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf963f809ee---pusefajakexuvo.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/97099407338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dividing+unit+fractions+worksheet+answersPDF 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_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 11056 bytes
SHA-256: 1a2f802c48bab330aa3d314bd63dbacddb36a20db42cc505b9d21f00cdd3c440
font_01_sfnt_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABC 19240 bytes
SHA-256: 758f8973b47ba1d79e6c7981c8b5816fad696e3b2d6af849dc2107d7bb5f8c16

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