Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e94513587a34e1…

MALICIOUS

PDF

83.3 KB Created: 2021-09-23 10:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 64a0b19d6f25b899c645860b07757708 SHA-1: e16b86f79f638143eab2acf9aec383ee5224b4d7 SHA-256: d2e94513587a34e1cffd89fe7d668b3a16c65a4cdd88e5e90be8fc2998a1ad87
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=make+password+visible+meaning PDF link annotation
    • http://nbc.ua/design/pic/file/50041519133.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/semolobepazozuv.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/buxuru.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/5957597200.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/11227634698.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/jesisojaxuferadupivugusir.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/texovaporovopago.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/4tjouurcsv724jmg4nqn6evcar/31264567360.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/3098078810.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/32130522538.pdfIn PDF document text
    • http://sbcnepal.com/images/file/82346586167.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/7440248549.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cb5ad0040---66858266527.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/95736971667.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/volegadebil.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/26074110404.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149662c50c3b---30978353018.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/jovusez.pdfIn PDF document text
    • https://alariel.be/userfiles/file/waniji.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_off0000e1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 11012 bytes
SHA-256: a99d44a7c749c1db8df4a8dd9944d4edcc23e1c6731380a1dd1ba6b9c3f49e23
font_02_sfnt_off0001132e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 17152 bytes
SHA-256: 764fd67d5fa7adbfadfa7cfbf6b2d55530b9a6f047c771a262a533f8b1ec53ef

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