Malicious PDF — malware analysis report

Static analysis result for SHA-256 839ae9b5ad7e7a20…

MALICIOUS

PDF

104.6 KB Created: 2021-07-19 18:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8219bd3cd40357025c2f3878bf556084 SHA-1: 57f31f677e1e2e62ea40847ad026dce25d7a2cc5 SHA-256: 839ae9b5ad7e7a20ffa30083020ae6020c1e7d85d0a3ab76b746e60cf1ad74b7
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://gumberryoleschool.com/clients/33891/File/61533826295.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793bf08fc04---86016966149.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/21646625326.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/jamol.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c586a7723---10660585245.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/60280106206.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/tefibisajodavofabomuna.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e563b18d2b---57104773858.pdfIn PDF document text
    • https://spacio.hk/attachment/file/wivup.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/dcci1lgkk8p63plj435bb7g949/44659569947.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/67590137398.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/33823569031.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/41hieb08iph9r27i9jbbkk6633/mezerudifesemurojo.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/v3dt0ab4umi7icoubu3hoildng/91114298263.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/5c6f3bfc71826887bd12913925bc03a9/polubitotolavi.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/aafe97009af98391c7ee99c0a58086c9/51116022564.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/6006492209.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/41509317546.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15da87dc46---pogupuzineruzuwesezuw.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae96abe0b5---pagijemamifugevararazagim.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/bc30733810e7fd90fc70575ace925e4d/65909835145.pdfIn PDF document text
    • https://reniuved.it/file/nojapaninitenesuw.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/152bf1c89e04c72af054e13f60643934/jakiwakazirogezufizisarix.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/44da2337598175efdef89ee2f6507c78/54832234536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=residual+thymic+tissue+in+adultsPDF 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_off0001345e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 18620 bytes
SHA-256: e9726b0a92118329793f776ceadf40dc3113f7c9f0736092bb4a2fdce26ad900
font_01_sfnt_off0001648b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1648B 10676 bytes
SHA-256: 216d5d38d2a36fcee476045bd61cfdb4ffdeb26fa04fb98bdc737152a533db2a
font_02_sfnt_off00017cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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