Malicious PDF — malware analysis report

Static analysis result for SHA-256 731ea1b88d6a8758…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 06:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 227a24ba7177acbb8beef599c41b79cf SHA-1: 1578febaf79f3f8cc2d2349baebd4ca02c421205 SHA-256: 731ea1b88d6a8758dde01485a33cb5e08d88c936b02baf28fbffb49d27bead60
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS upload storage, suggesting a lure to download further malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely provides instructions to decrypt an archive, a common tactic to bypass gateway scanning. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://serwisnawigacji.pl/userfiles/file/43457851758.pdf In PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea659de85c---4507520357.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a466bc6b7837f33dbfbd3e0fcf979a10/82641000263.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/36829486839.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/mavudijaweguwezer.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/rufezedeloregup.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/26511097325.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ae71b92d9e5---20014864206.pdfIn PDF document text
    • http://texmet.pl/userimages/file/65855598003.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/gesewudixovikowix.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/lixazowekowivetupatater.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/fabiguvan.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/zuwamod.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/bepevusa.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/37830079895.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/gusodikibefogowo.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608785c8025ac---30801167587.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/fanenawatidome.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc68b151c6---xovumuliv.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/binujewupij.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/sarulifivozufuxanepiraz.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bc2067750---58451517963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=last+year+10th+board+question+paper+cbse+mathsPDF 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_off0000dd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 18028 bytes
SHA-256: f5acf5496cbc36f60d4428b0fd122b61d55a5cfbd15a224d72cb4273183cb717
font_02_sfnt_off000123be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BE 11364 bytes
SHA-256: cb618e8ca5a3f9c4818db032be9795a4e4732c2ae593b92f381a1f54b5d8088f

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