Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9c6d4a137cc9aa…

MALICIOUS

PDF

75.5 KB Created: 2021-09-21 07:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fc7f916e9c3ed1d44f4db5a2eb9af121 SHA-1: a2d485ddb26ee7de0d96a6a2ed6090f9680da7ac SHA-256: 3e9c6d4a137cc9aa1fe406a5a6db47e4e6f70be43908dbbcd91ee4568e9fd8b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF being identified as a phishing trojan. Although no scripts were directly extracted, the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://enilubricant.hoakhanh.vn/uploads/image/files/46230745940.pdf In PDF document text
    • http://pnlestari.com/visitbali/image/files/zitamabidoxigobu.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/80658350264.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/45630032453.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/15732536856.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/88238264961.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/20805837904.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/tonepegefem.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161492838a087f---pegubovosu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452b50b6e80---6996050143.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/kopup.pdfIn PDF document text
    • http://llux.vn/uploads/files/44271740967.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/lirukiwezebuxube.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/78770507328.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/vexokatitil.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/59827836019.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/5957625595.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/36944866338.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/kifozaxetibo.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/43743395617.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/boxebiluzavuzipod.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131652f2b1e8---renifapagikukuvanakidev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=need+for+speed+2+mod+apkPDF 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_off0000c489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC489 16976 bytes
SHA-256: 21d1b5b7fe09e276598000ca9a9873c9162646519804546833e9541bc31c7b82
font_01_sfnt_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 10508 bytes
SHA-256: 4682df12d15d61e24a5dcd366c470026c61a39a8840ed3d859d82cc6e055e231
font_02_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1