Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bf38b51615124b…

MALICIOUS

PDF

94.3 KB Created: 2021-08-01 19:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6ddd3be7439d1fffc5ccd8cb20cb1c7 SHA-1: c942e765ff2b9f84c8b97e6faf2388cb2cda81c6 SHA-256: f4bf38b51615124b6b60057ddd33914bdc55ec1574b305077ec4e806b9c894dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this attack pattern. While no scripts were explicitly extracted, the nature of the URLs and the PDF format suggest potential for JavaScript exploitation (T1059.007) or a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://sns.hu/_user/file/zawekimotorimanapa.pdf In PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/29831861161.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/6m4u492cbn3hpnhe069bimljfe/meluvakelevola.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70dfea0580---pajumobalolisesipopedel.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baca8d38cf---87829826116.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/jkvteh2jrkllsuk0ucc73lg17n/98234821714.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b62257a2---10194976880.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/jaxozijewimeniwagu.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/sibano.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/fofopivilila.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/d9e492d365b0aa16397873641d320e30/wadamawedofozuduvofedaraz.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964c4ade8c3---wuborugagafotezizere.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/90181273001.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/26690325290.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a205595da34---45252313420.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/d528e6ad2fc5f81cfa597bf4fd6b16e9/69009107302.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608397339b312---xoserigedabowoxamav.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/39390521459.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/u64in61rkchmjaqumqmb7rrjh7/tubaxezire.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9ac56c36f---50728643456.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/77b7cf16ff6b28b2168b9c649b6822cf/roxulaburamaxumatot.pdfIn PDF document text
    • http://irths.com/upload_files/files/81245335481.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/80653838802.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/51842776460.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/deporupora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=clash+of+clans+wifi+hack+gems+onlinePDF 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_off000106bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED2 10792 bytes
SHA-256: 33ea30646f9ff1feeecb12f129462feb176955da3b5ee0c2d78430fbce2f616c
font_02_sfnt_off0001378d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378D 21316 bytes
SHA-256: da9bbd708e93fd57db0e0da0c1fb8d81e9e9906b0573c0e1e5a986d1f2e60ba6

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