Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ca9a3101cd0793…

MALICIOUS

PDF

70.4 KB Created: 2021-09-24 12:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 674015feff58d516d444ad9385fe59e5 SHA-1: cb515db9570fa57a796873d7d581aeb6652ef62b SHA-256: a6ca9a3101cd0793059b1f5fdf4b278d00d35dca1d709cd8696e7fab8a1a93de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm strategy pointing to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the link farm structure suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=itunes+for+android+phones+free+download PDF link annotation
    • http://compsult.net/userfiles/file/mokivokonojo.pdfIn PDF document text
    • http://midospa.com/upload/files/58087831207.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/labowulezowugemuve.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/vovozinafi.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/21148928971.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/45989111496.pdfIn PDF document text
    • http://pronobile.de/catalog/file/wisejupibotekabagu.pdfIn PDF document text
    • https://euchebnici.com/img/file/xidewekepe.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/59792234883.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/zaxuwoxasidadewolida.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/kilonab.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/wodavukewagezozatipako.pdfIn PDF document text
    • https://nppmaudaha.in/ckfinder/userfiles/files/3895994120.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/xewidilud.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/wulese.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6e5117652---37174718888.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/93552672377.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/solovezaj.pdfIn PDF document text
    • https://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/63690368693.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/69154917980.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109221054246228.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613a773b184be---17634293507.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/73018834259.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e24515d238---57804621169.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_off0000b24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24B 10732 bytes
SHA-256: cee26294dfcd5fa8366034711011c16de26167a40ba57b0260e86b548e811b90
font_01_sfnt_off0000caed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAED 15988 bytes
SHA-256: fe02d6fb01b951a3943e926618d37bc64b2bdfdf729c5808135e6cf8f9515ba2
font_02_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1