Malicious PDF — malware analysis report

Static analysis result for SHA-256 f335a6f864fbdc71…

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 04:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a008ba0f3ccc85d7f5508f1ca1139eb3 SHA-1: b59449dd6263ad426800c4eb4f602ee613fa8eca SHA-256: f335a6f864fbdc71396e17e62e655571a79b0d6b12a6bbc07d9a370c12d80b0c
216 Risk Score

Malware Insights

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

The PDF document employs a social engineering tactic, presenting a lure to install a browser extension or update, which is a common method for delivering malware or stealing credentials. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the lure suggest the potential for JavaScript execution or exploitation to achieve its goal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ldksolar-officialliquidation.com/userfiles/files/81405853692.pdf In PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/fadununebuj.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/zegagafuninunaxipat.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/4845616097.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/bosotija.pdfPDF link annotation
    • http://jandenzobv.com/image_uploads/file/14753400025.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/22433548863.pdfIn PDF document text
    • http://gewald.ru/content/Files/sabuwifigonuwumosoxumez.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/derogaberosi.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/72161787113.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139f6a0104f3---28727354556.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/losifuwikul.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0902/f151d5c43a2cac0414c89ef241736c57.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/gudenobosudoxumegudenixuv.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/522521f4bd0eaffaaa91d2e33d34be4f/31293908991.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/22528417094.pdfIn PDF document text
    • http://awards.nl/img/cms/file/57363719753.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/87286498883.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/winezoge.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/tavof.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d7bf3f648b29aa3243f35535a5123114/77417825197.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/80822397280.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/zapevapav.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33172e73c---49234122405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+adblock+android+browserPDF 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_off0000c2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2ED 16872 bytes
SHA-256: 509cb143c0d497183981101776c7b90513ea8aef9e736402f6e3e01a417ff71b
font_01_sfnt_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001067e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 10732 bytes
SHA-256: 7504d2e92948752a0cc6cca1130153489c61f21b0ac275cd09f6fc52e87e7bc5

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