Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fcb80ddebddd5f2…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 11:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1465003363cf183cfd2071952beb61c SHA-1: 10ff5e74c8f8850a58d7061ebbb51a2ba66e2131 SHA-256: 2fcb80ddebddd5f2c91a118113e0f653254f789ede4fdfe11439d97ed5dcb1c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm, directing users to multiple external URLs. Several of these URLs point to compromised WordPress upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://tahitotfalu.hu/ckfinder/userfiles/files/80270296777.pdf In PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/goteziluxigawadebam.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/bexivopabawumanovages.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ae9672208d9c5821454b14754ae09591/81548552063.pdfIn PDF document text
    • http://labsshop.com/d/files/lonesaxaxoworofodawigo.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/b7653ff72ee6b65b07a72cb468b7e27b/pinaxune.pdfIn PDF document text
    • http://thaismenews.com/userfiles/files/87197554200.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/89362152339.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/guxesazusanujidupipujesal.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/nupuvirusinavonotawabomax.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/94863073073.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109062325473904.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/afa0ct43djjhv2udvtop3vq6v0/siziropusoxirixudis.pdfIn PDF document text
    • http://showpelec.com/data/file/20210919_194859_936.pdfIn PDF document text
    • https://htchninc.com/d/files/82742327069.pdfIn PDF document text
    • http://qdjshg.com/files/file/dulumibutemawelavotu.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/96023686276.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161497caa383b5---71261682305.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/43720958243.pdfIn PDF document text
    • http://jakspravnenapsa.cz/userfiles/file/30181605748.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/givit.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/62233165364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=inspiring+words+beginning+with+cPDF 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_off0000acce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACCE 16016 bytes
SHA-256: e287f819fec63f86e751e61b996fd3ea4cac3d60d64506730b385693dbb4e86c
font_01_sfnt_off0000d571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 10760 bytes
SHA-256: 6656d99186bea6a81bd31083c893d4fa15b2f9f6230b7b516851f17dd69bf057