Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f04c295d2950d3c…

MALICIOUS

PDF

69.8 KB Created: 2021-09-17 15:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a29ebc38d90a43f20a70423f5a0c64d0 SHA-1: 18fcc5dc8bfe609d5fd84c29631c2ed11bf934a9 SHA-256: 7f04c295d2950d3cee40aa6557cb86de3fc1aaddc1706a6b6a317a4d6e993f76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO poisoning tactic. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

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://togelunited4d.com/contents/files/wutipulolixetuzilupakijo.pdf In PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144860d00959---53548700503.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140d4c77980c---32603702494.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/reboradazajasajapaki.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/d5eaa25c03c993ff2b610fa122fe7664/tutasalelawusewedi.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/zeser.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/17675544340.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/5030135772.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd460e35aa---golibosowopesomugateto.pdfIn PDF document text
    • https://sapthagireesyathra.com/userfiles/file/43907446782.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/fagotexabularabo.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/jenibe.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbc24d21e---feveroxulu.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161419f1aecb9c---gudeketobopesudu.pdfIn PDF document text
    • https://conrays.ru/f/data/3592300911.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/faa224ee7399e87bea04d660efabc5d2/78352147166.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/72726304324.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/55170374718.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210908/file/febizikerimagosisejipavom.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/fizatomezejimapozi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348bad910fe---muxow.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16140ef16188c4---19524504258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=game+booster+rootPDF 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_off0000b444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB444 15304 bytes
SHA-256: d34015780ced8ceccd13261d4696c2534acd5cbb5998e4b140b10c5822af2717
font_01_sfnt_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 10204 bytes
SHA-256: 1589ed3d55343602757e9b09f3020d96a0b47be241c86ce5b363361c7c13997f

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