Malicious PDF — malware analysis report

Static analysis result for SHA-256 3904fe590f14dd67…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 15:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8972b920ff5716a8877bfac075d00eff SHA-1: f7eaf02816394eb58c801c87817b0d14e4aa2367 SHA-256: 3904fe590f14dd67d6ef7b98ae4ba7b9d09d1a0336e3a01abb00db14d193c0b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://willmarareachamber.com/ckfinder/userfiles/files/80456826219.pdf In PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/sofubuvopofelejok.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/67179219523.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/48292710267.pdfIn PDF document text
    • http://teknis.it/userfiles/files/90552854587.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/30722333928.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/70083781839.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/27194840782.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949846d6fa1---mopinetoval.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2039c411669bab41ce61efeceeb47581/vebafajubipupawanobuzoben.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c879193026c48a878a44928564b8c40/raxazufinawezi.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/raxaxerisemosesujexigis.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/96142140374.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094932590713---58124595938.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/tesojokumifen.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/4672812881.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/610d5eec0d2f47049984b59a012cad40/31046928191.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/klgc2j4rkmroe729k64jn5f5nv/24717776393.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1987d9d9df---mawiditapidatigo.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/28093236378.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8e5ce8fbe---54526390575.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jagunapovefopebusovered.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c53d2bc2eaa9310845cb7ca81ea4e820/losalawodukedilobozuzifix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+install+mods+to+minecraft+serverPDF 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_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 17408 bytes
SHA-256: 8939324e5c835cab6afc28834153283888ac3a4fe0340563e16413c7de17ed2f
font_01_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 10780 bytes
SHA-256: 6b7e408756758d4ea397fe149f82ebdfa03033dec8c7ced064245cdff2cab5f3