Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a79e238289504c9…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 10:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a38d193cf569d4180be28ed74584d68d SHA-1: 898ff31f8ac19e823d39140d0e778bfde1f64b8a SHA-256: 3a79e238289504c94601c9bedf7c3fe54b0f31f36d0c53a212310a7726d97157
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=socialismo+utopico+definicion+pdf PDF link annotation
    • https://systematix.pl/userfiles/file/nujasetetifisu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3524cc1bc693f8acf641da19cd092c53/sisagazapimapedupin.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ce843934a---kotevoroludonita.pdfIn PDF document text
    • http://pneusmarene.it/images/file/zuxukoxajabunedani.pdfIn PDF document text
    • http://vodnik48.ru/content/file/widisunepunuroda.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160738ed2eea50---jeniverafefegafefoteba.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/nimiranipumajemelevip.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/2e0e60623e0060a1d14199d8dce9301e/39428879836.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/8897874302.pdfIn PDF document text
    • http://weingut-suppan.at/files/nunutobalukepalukopidefax.pdfIn PDF document text
    • http://techbis.pl/files/file/27144167571.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/43043671396.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/72670705715.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/76615818429.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/ca90b7e7cdb97597daacd55285cb07a8/96080466193.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/mepibarosokobanepiwomumi.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/wijumemitulopuko.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/sazelekovatajabajeni.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106424f0dc16---29655067645.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/tokafosew.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979e9f76a8c---kigepuxividirifi.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/91951875254.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_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 10856 bytes
SHA-256: 4c51df1b15f24c8426dd24e1f3020cd453c7881f483aff420cd0c253ca5106e3
font_01_sfnt_off00010578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 19232 bytes
SHA-256: 65a993a235f53745cd868adad5faa8a18cb8b03731130ae0fe5e783ca7ff0ae8
font_02_sfnt_off000136e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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