Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb9adaa924f293e…

MALICIOUS

PDF

100.5 KB Created: 2021-06-29 19:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48249561d1d4a9090177eebf45eee670 SHA-1: 360092446ebc046f12682fd9c046473e416fbe2e SHA-256: 7cb9adaa924f293eae3dd33866c20d2e3670f9f08fec96f4083a3b49f3146849
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The primary purpose appears to be directing users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9415

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://dchs80.com/clients/c/cb/cbc185099defa3274d3d4f74835fd64f/File/63475154702.pdf In PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160924e4f0edd0---59597280350.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/921276a49c71660ad1522dd2e4780de6/925816933.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6448ab68af---98633515226.pdfIn PDF document text
    • https://biocoils.com/img/file/fikeramekidozasafinig.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/21702635314.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ingppvinik52bk2gfco6ie54d7/fasofew.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/72965546302.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/namidakifabu.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/81011565228.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607719c696ee8---39042720458.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/et5a7dcdsl7a8otv8o0o4b3fms/21107119100.pdfIn PDF document text
    • http://praguetransfer.com/files/file/37264934803.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/db3904b60aa65170556143d8d2b28c7d/sarorodosukukalive.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88dc132520---36118674571.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608465570c425---badozogojaw.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160983278475f1---78787531965.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c048cfc87---48381578673.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/mozalipedaxibimujawudivuz.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/40705687733.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/0g7deir2u02bcvpf6omov9bk27/febabigavev.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/kobegunejiba.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/rowumebabonur.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/d7b4d20bcbf40a00e1e4c072ab2b851b/lalevorimukibad.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5019d09b58e0d4c64b00ca5d98597cf3/domewofuko.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c98a82ec63c---54492041298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fermentation+meaning+in+tamilPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013eed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13EED 18712 bytes
SHA-256: 1cfc50af79e6947f361a15d0a41303848751397323e084e506df1bd194c5b8a3
font_00_sfnt_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 28132 bytes
SHA-256: a804c488d25a932042b3c0182f72beb7d8d5a8eefc9e7e061722413fc46adc79
font_01_sfnt_off000127f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F4 10260 bytes
SHA-256: 53f702016d3fa7faa5f6633e1aefebf3747307dac74cc32257ed75f14f763c43
font_03_sfnt_off00015db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB0 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_04_sfnt_off00016b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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