Malicious PDF — malware analysis report

Static analysis result for SHA-256 8caaf4d3d844b6a7…

MALICIOUS

PDF

78.2 KB Created: 2021-09-15 19:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96ebfb6318d4d2261d2b6273bb5e49fe SHA-1: 0b5d44569506554f12081b7f5bc0de41d08edd48 SHA-256: 8caaf4d3d844b6a710e5f5dd247d9584e275c7ac3254b94972bd49b29b7da2af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress upload storage or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=how+to+block+all+messages+on+android PDF link annotation
    • http://encino.ilovepokebar.com/uploads/files/fuporeputuxunezovujoke.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/vixolale.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/salad.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/51d277f228326d97b19be79436f9a39c/55925355574.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/gowizofu.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/nuwapipota.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/22734199797.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/27852159567.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f59b8a4698---sitov.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/pudeposuxededafutajatiz.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/vitinimowajowesatezorami.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/lifan.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/tizizufominiza.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/voroferagagiborag.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/85475165919.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/sazabibiwunalubomes.pdfIn PDF document text
    • http://prestopc.it/upload/file/69976080694.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/17397851704.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/giwopebibufodosov.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/legawuxonirikawa.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210904_153829.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/49971567628.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/411bb1f923c466fb870ad4f4a85b800d/jovesep.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/dulafuveza.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/xonusewev.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/90887484397.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_off0000cdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB3 16796 bytes
SHA-256: 1fc89955a07bf605e623064334f213336c35da78f5dcef16d242b6e9e33590eb
font_01_sfnt_off0000f8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 11020 bytes
SHA-256: 58ad3d452acd6c7b1e237d2c911b9fe0025308cf10ec95482be0c67842989057
font_02_sfnt_off0001126c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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