Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff794170f48d7b8…

MALICIOUS

PDF

83.3 KB Created: 2021-08-21 15:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 799ada31126c05ca737e23a7620a2dd2 SHA-1: ebb9568ff26f8bcbf648018cc19ac7b593532770 SHA-256: 9ff794170f48d7b8376dbb94bc3bba97f16f5618eff99eee74752c7f46787b34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and link farm indicators suggest a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be non-readable content, likely generated by wkhtmltopdf, further supporting a malicious intent rather than legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://drafthe.ru/uplcv?utm_term=how+to+download+videoder+app+in+iphone PDF link annotation
    • http://alkanboya.com/files/file///livumofozoxamesonebel.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/d66d6fosm7f1sddml30anm8qoa/kozowapetezixokis.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/83350907942.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/79711639739.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/wisagasaxafiketorujuju.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e10771f35---kizagomomosexulef.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/57785021929.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/88b4rcc0he1v9os93n4t7jv46d/xiseguro.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/vesuniwu.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210710_53F9D36C0D913444.pdfIn PDF document text
    • http://goldmustang.ru/files/files/pisamajatuwelabutevilinaj.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/67299525075.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1540d7b69c8656a3d3356f1034e6810c/kujaborotigunilexo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd82cd52cb---7274968936.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/81b67c469a3b39df76f097fd44e9d170/72505494896.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/pujabaf.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/256a09a307798592fe74c521cb2bcc30/76794293161.pdfIn PDF document text
    • http://grabnerestriche.at/46714651735.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/36087222450.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4fc55371c---87335078895.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/aab5cac5239b7e050353f39d137cc8b9/gagorajazopuruvunimul.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/phbk5pcctlaftr05om0hr7stp0/lodalerefa.pdfIn PDF document text
    • 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_off0000dd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 19692 bytes
SHA-256: bf9c296f24ada7b1d46d34024d8713307bbaaf21e50f276ccb2aaeba2307d603
font_01_sfnt_off00010f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F85 10464 bytes
SHA-256: ac3c9fa106dd2f83ae41ace4507737930a5bfe197ac4b21fac973f7b863c0454
font_02_sfnt_off00012729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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