Malicious PDF — malware analysis report

Static analysis result for SHA-256 d300ac96057229d9…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 04:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7ac76b8d78f678c48b1c9b803bbef5ea SHA-1: 57677b7765d519bf45de96c9e5bd511b8746464d SHA-256: d300ac96057229d9b909ae1a80fa8b2b049bd5f0d00085fb9d2191294f4c89a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV both flagged this file as malicious, specifically identifying it as a phishing trojan. The presence of a link farm on disposable hosting and the use of UTM parameters suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://philabc.ru/uplcv?utm_term=werewolf+spell+that+works+in+the+day PDF link annotation
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075f9ec9eca5---jekuvaroja.pdfIn PDF document text
    • http://0930actress.com/files/files/zizodudopa.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714c9f37e0a---91921729370.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/fa68f8cfcab545b2e3f5427d1ca8e3a1/nelegimazukisomu.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b4d5c06e3---wozuzu.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/pexoputu.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/wabukujefusuruxawelamud.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c0cf37507---90747374220.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/bedozi.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f0246807b---88365421612.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/80669367188.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/51dd0e5da0bfc4b7b7263a89e5f188c8/depevuwafesuxi.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/34932420001.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6dbe9daffe63ab153d91906a3ceddc6f/10036724376.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a02fa03a3---77670908389.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/trujkmpoptmmtnh2mlov2cnrue/keniketo.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cebecd5e872---vijenofudose.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d904b2199f142fa175bd2350bf9bcd5d/77564116203.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/83040102119.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ec77ac1a---60727405072.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/palijubimiwetilafuzekover.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 10880 bytes
SHA-256: bc845b9e4e397f4083b6e6d3dba3b9a9aa2d0a0ad4828ec8d2f8e143d7831e48
font_01_sfnt_off0001043f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C51 17444 bytes
SHA-256: eaff54c5356caf78bdb750aad3c5fa27a04f7aaf94db0affd25a3efc17268394

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