Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17acc81f689735e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-24 10:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c45ae9da5381c0bf7860de47acf45ad5 SHA-1: 99ee0992a7c303aec0f5ad80ca2fc858790026a6 SHA-256: a17acc81f689735edd6df802255933960fc6343b0dbb56d27ccc8cd736397d51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a focus on SEO poisoning to attract unsuspecting users searching for free software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://pistant.ru/uplcv?utm_term=free+office+product+key+2020 PDF link annotation
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/71604876829.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/18477996638.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/70170945728.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614091d9c1322---vokevuludusu.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/48196672642.pdfIn PDF document text
    • https://grandegroup.net/files/53334913981.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e64b22a640a8b48db74132b5b673c24b/ginat.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/jogemomurekelinavasopu.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/8816784123.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/rudedam.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/1989448570.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e7ba94bf9---24331512218.pdfIn PDF document text
    • http://axwelindia.com/uploads/tukopilereligazowakar.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/mowiruwurulupeta.pdfIn PDF document text
    • http://skupka23.ru/upload/m/91923246899.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/povilozimopubamirebanew.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/dovozabuju.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/72424164671.pdfIn PDF document text
    • http://7profi.net/userfiles/file/gepukelogilurubeketoxop.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/kuwizo.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/35899002172.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/39558740593.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/84944317533.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/nisupirumesukujewika.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/jekumo.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_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 17480 bytes
SHA-256: e1b519be94ff4bc91e4e30fc5d8a7286b180b57fa5f0f64c59f4d20d4750173f
font_02_sfnt_off00011f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0C 10656 bytes
SHA-256: a3c2e99a5697bcc47cbdb0ed4188e83eeb8a95213ecd83cad35a289a8a91866b

Open this report in the interactive analyzer, or submit your own file for analysis.