Malicious PDF — malware analysis report

Static analysis result for SHA-256 185553f6eb1cbad1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 21:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 254e418dfa5e47bc37ad2b5441f6a30a SHA-1: 3a3557262486cf5d2db51ad9a104ad30f703e9ef SHA-256: 185553f6eb1cbad168c779ada9b7da4d0cbea56d0703e0de339809610404eee3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pointvirgule.ca/upload/editor/file/bijep.pdf In PDF document text
    • https://zold-kommando.hu/files/71733802941.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/risamorimiper.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/7683612629.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/rafivezafakewivizubunogav.pdfIn PDF document text
    • https://wecareprogram.org/images/file/leketelolavu.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/mekixomarutapolukab.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/57308540070.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/86osje0k19hkutttqf53hjo2kh/mijavabolijufunujezexejon.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/zelelibutideb.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/panewatiso.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/6840715058.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/jalisifuvepudezeniwi.pdfIn PDF document text
    • https://begili.com/uploads/image/files/9387900702.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/5672728870.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/ca94734cbc3c8e7ca7e266afa9f9f16a/sagasopare.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/22004738219.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050712270365.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/sabuwiresopilukusakosose.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/bc319cda971ed6e24a9da63a6302cfd9/94517047560.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6lbujpfoum6srqn68r4r2e0a75/29353766661.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be4d3a4979b---3752585118.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/jiwoxivigakuzivexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=chess+game+tips+and+tricks+pdf+in+teluguPDF 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_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 17080 bytes
SHA-256: d1d7061d8bdaab64bdca934797eb8f131fd34bc1bb528bfbbb60b3f034847673
font_01_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 11172 bytes
SHA-256: 88c1e7d6ac21822d2b04c243ae00279fc0c1f01dbf9e2c6f30fba172e7c6c38c
font_02_sfnt_off00012289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1