Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fcf948bf86e5945…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 21:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 78a43cb7262c5ed8505d24e5dbbd27f6 SHA-1: d260b53c5618f89a5c12f4b8698e77fb77d4b4d8 SHA-256: 9fcf948bf86e5945841cad14b734aff3eeff1ad3d113eb8792a5e1fbcfd6b9ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, some pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://riverhouse.at/pcms/content/file/zowojojurewulogafapof.pdf In PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b7a2b6aa1c900aa3f8c2415ca3402488/71352505665.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/webexeridulifogixuk.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/baputabobiwesidu.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/26238035762.pdfIn PDF document text
    • https://onecre.com/images/content/files/50698933548.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/rarojamesidopebenofer.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/sevelogobosavevejuzozit.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/63210602036.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/jefimitadodikutene.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/36522275513.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/14370456011.pdfIn PDF document text
    • http://tion.hu/upload/file/93460635872.pdfIn PDF document text
    • http://seamacros.com/upload/file/xujamizeborinenetefi.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/takupaviduwukifizapen.pdfIn PDF document text
    • http://4yoga.by/pics/files/jatufepagawix.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/mozevagiwonijav.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/8328964945.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/dirimubebumil.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136caf609083---kemodorerogugasumubajawi.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/xidisev.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/54b7425204a270b03b1afedb0d85cdcb/rosafevosodujeluzodiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=god+eater+burst+isoPDF 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_off0000b0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC901 10368 bytes
SHA-256: 6167ddd571cd290934219cbcc6e37d4f50e92861ad814e1350e10a236f2b539a
font_02_sfnt_off0000e096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE096 15596 bytes
SHA-256: ff9719775533fd91eacec02fd393c2295dd7462a4cf85d3253451a472e05dd6b