Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5127b90f4ef154f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-10 08:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5ce9453b3652dd384331b850c83ae257 SHA-1: 54bee0cf68ef0fbbb76a64670d49fb9d932d3dff SHA-256: d5127b90f4ef154f2863d8b3812cb967cb1c8a06e34d068eb02c68d1c9d0a181
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the URL structure and heuristic firings are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://smidgel.ru/uplcv?utm_term=bubble+gum+sim+codes PDF link annotation
    • http://bukharaalpharetta.com/sites/default/files/file/dojaxoxaga.pdfIn PDF document text
    • http://cl-pub.com/files/files/23444339751.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/jijaxunibetimisur.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/lirawera.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pevizimeboleruf.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/63c3bddb4ac76d48af623f1a866c2988/36909157368.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/fesodojezelidevim.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d7156da5---daxupafenevij.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/kenizib.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161354b9e4577b---55575465447.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/lokilosewapimifomodilino.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6717f8cc7b9807b7c0ff372a1d5daade/55593514703.pdfIn PDF document text
    • https://bliznacite.com/files/mofunezutanajufabodaxo.pdfIn PDF document text
    • http://apple888.vn/luutru/files/44657446901.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/30593138854.pdfIn PDF document text
    • https://bfull.ru/uploads/files/55396966976.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/83150835015.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/vinimofeporogiv.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e72b0c160---49087940410.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/30852893108.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4567efb51---fexavewoduzebim.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 10544 bytes
SHA-256: 7abd00ac8cf120efa49bf8d4895719eb0b053cf8e8e016aeda2e0062ce0a9365
font_02_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 17080 bytes
SHA-256: 6f5aece3a88e1fc6c7976ceccd95a495aa8ae15d403a9d80fc43eb05b15bcd8f