Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bf0ce75846fc14…

MALICIOUS

PDF

81.8 KB Created: 2021-09-22 23:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 677937e8a251bef1531b31f0931b5a16 SHA-1: 5fbad62ad71ea8faa89b2a472f5cb1f19d72be0e SHA-256: c7bf0ce75846fc14693b380832030889e9c2c7b943bed77c8d2e8744cac3d75b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external links. Several heuristics indicate the PDF is a link farm hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and external links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wastran.ru/uplcv?utm_term=comment+faire+un+jeu+sur+android PDF link annotation
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b2ca8ce0ba451a7a939fe742db153bbf/tevexalupotor.pdfIn PDF document text
    • http://klenderbio.com/upload/files/xosop.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/273989298.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/24354455350.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/79077841670.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161370a0c9fd89---10796187885.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/23274333265.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/dodesexuzilofovabu.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/sarazix.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/muzutovawetosovusoruwuza.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/29298917614.pdfIn PDF document text
    • http://aquatherm-graz.at/files/fetotuv.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb6ead6c9cc435fcc181266ddf78cf87/94436425484.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/poponomofowipifijota.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/23119145087.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/fazipimebibafiralom.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/73250633394.pdfIn PDF document text
    • http://kco.su/userfiles/file/tufepatisigaxelofare.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/dexibulidetifoxenadenavup.pdfIn PDF document text
    • http://eventechsite.com/files/files/38494794025.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/37602539809.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/nopobonawofaxidum.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/21297727575.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137485e4d67e---mesotajivugo.pdfIn PDF document text
    • http://pronobile.com/catalog/file/41934383395.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/88612691168.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_off0000da13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA13 18580 bytes
SHA-256: e9291eae2ea6d5c502a5087ac068255b724bbac39e3ad69b88833894ff35c8b7
font_01_sfnt_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 10732 bytes
SHA-256: e8291655bfa6301628b76bd7d98bbde0eb987faedacdd88b1970eb1bdd2c4d76
font_02_sfnt_off00012171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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