Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b16993fb8f39c0d…

MALICIOUS

PDF

90.0 KB Created: 2021-08-12 03:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4117dc9bad78abab5786f2f818d83180 SHA-1: 3536598c6ba61c6a3372e904231c49e1854daa4e SHA-256: 9b16993fb8f39c0d26c8748a87fbead83a3a3fed565eec9f0b2fb541bdc8b10a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://huntic.ru/uplcv?utm_term=sharp+inverter+air+conditioner+service+manual PDF link annotation
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8144ba1f0f---65992864463.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///40364962077.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/90kv987def427hi5fn1thb7d59/xixob.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/62880601143.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/8559962926.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/sezigev.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1f1b238ff---jopujinemuvipo.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077f85508da2---lupabofopid.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077329ba6b5c---10409374753.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/ziwesujavinetil.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/51574053465.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/bdfa642a54b538d3b1d80f4fe8877365/87185744079.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a35b8a21758---xomunulefaveb.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160722b7ce8f25---puwurofigukasimap.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/xotapapalevofowotenivit.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/fodafafumejikipipulumefa.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/xobibapedasazulu.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/wubarenagate.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/mujazodugomagovudiw.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2773f6e7---jupekirogobevigifil.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/aba52163fbc5271f136f2016c2b3ef56/16449977282.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_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 11020 bytes
SHA-256: 83b36e16751140dceddc34e7b17f44c0de8de30129acdfba94bc54fe3a6b9248
font_02_sfnt_off00012d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D17 17180 bytes
SHA-256: 2848fc9d871f2c76c953f45e312301b3d3d43f457500d3317e0b615048184c10

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