Malicious PDF — malware analysis report

Static analysis result for SHA-256 21074b17d08a1fe3…

MALICIOUS

PDF

75.0 KB Created: 2021-09-07 01:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fa173f9bcc3f84dd14caeba1f745cca6 SHA-1: 58fb1436c39ef02fafd02e6ad5378681fb92e364 SHA-256: 21074b17d08a1fe353c998c4debe2fbbdf16280585390e249724768a7aa2bf22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://transbur.ru/admin/ckfinder/userfiles/files/bazolonapusogeneg.pdf In PDF document text
    • http://berbun.com/user_img/file/9681811296.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/po1v9nkkdcp9e9h6ors74uh8hf/41382567551.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb6bb4186---bugowokigenitinavina.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021070115042570554.pdfIn PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/kamilisejisusifezuruwixak.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/nekuvegemifibixeza.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/14718058173.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ca52c427240d42f6fd011a7700c3a983/98703750966.pdfIn PDF document text
    • http://sciattella.net/images/file/gokoji.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbda361749---34754138105.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/51c293bee38408702c137933a483851e/zonexi.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/45363ff9166182e292c863dc46ad2a69/wonutif.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/garexolavixuteb.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/zewepojisubunipunolofawi.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/dopadutobemosopilob.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd3a2ba8a---mezefa.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/16636836671.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/18792468212.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/94698876387.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/33736796200.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/31571139583.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/25/file/xawakitajoruligiwafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=riskesdas+adalah+pdfPDF link annotation
    • 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_off0000c482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC482 16652 bytes
SHA-256: bbe4eea3e7a70a8b62510b50da3f5cfad7b62c54dfba75e337b810c78fdf386b
font_01_sfnt_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 10308 bytes
SHA-256: ea299d1410b3a19452e95b6d6c7c97c92144242e5cb3694f8e277fe537dfba7e
font_02_sfnt_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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