Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0c1161b52e6d1c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-10 06:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d08483742374faa505a425cee1665a78 SHA-1: db03eb5105066829b41bd696e7c91a09c9be027b SHA-256: 4f0c1161b52e6d1c764b7a700c20cb7896eb65d60fe28e672cfd6e8cfd559392
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://desushibar.com/userfiles/file/rawipejus.pdf In PDF document text
    • http://dribblebar.pl/userfiles/file/tubupidelomudixobizaz.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/1d018e22e7148babcc35dd5a2addca26/60499689598.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210905_86EAFE3FB81EC827.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/lotukevenafotovag.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/konigawubipeloribasitemor.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/3418acvcs9el6muqsmhaljc66t/poxagokikotagajilig.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/wuzavulanorudato.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9de9c8f1---54013354328.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161359b645c855---54583091652.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/gijofowixegowanene.pdfIn PDF document text
    • https://kham.vn/userfiles/file/8347699711.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/likabusemisatomeferelip.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/gafanapumeles.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909073045999196.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/27406193594.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/lojotorasinukazupuwazu.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/vobeneji.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/81628673819.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/66782574149.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/68746217093.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/visadudul.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/xirovawibefoxezedaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=tongits+wars+installPDF 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_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 17892 bytes
SHA-256: 45af4d09cb5eb710ae6c07df83a99976ba5fce0ce74cf456864350b6cb76b4ac
font_01_sfnt_off00011a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13247 10200 bytes
SHA-256: 2521be78505a9c16e4d33e8929aa17858e8d3c55e9b1a3762e6fc3c17f87eeca

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