Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fac0181a49be3b…

MALICIOUS

PDF

92.8 KB Created: 2021-07-31 12:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17d973ab8473cc44a5cda0a4785cb708 SHA-1: 90b26a5d4a7bb13b2fad7e5b128db21292c0c2f9 SHA-256: a6fac0181a49be3b73607ebf644b6b3bc14957ec660d634940830fb9e1c3653c
244 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate social engineering tactics, including a fake download button and instructions for a password-protected archive, designed to trick the user into executing a malicious file. The document also contains numerous links to potentially compromised websites, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://thevisionkharj.com/userfiles/files/lemofafeg.pdf In PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/buloninovomibumovibo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b9d784af3---kajugujisidokil.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c9699df85---punof.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/58967380234.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/51738852575.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/84044572962.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c54db72cf542b0aa604e3e84a816ca16/lipararonapujogewutifaz.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/22545853826.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/6759856337.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d64d6af01---dajalikivek.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6261a3634d---famexexiko.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/54626783682.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/sezevod.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/26388302923.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/37104579224.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/43127ae18c8fc9db8f408ebed6b9b084/peforudanutenovo.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/rajitapirusan.pdfIn PDF document text
    • https://amblamy.ee/upload/file/gifobugaxu.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/nimidejenafupusaxu.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/38645602489.pdfIn PDF document text
    • http://chikatere.com/Upload/files/lezomazanotisipagabe.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/2b6dcfe54115d03dd861a78fe758aa85/77026243372.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ude0ln60k8ou80b0cf5dlbav18/61813708391.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/fozitulabig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+find+gta5.exe+filePDF 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_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 17872 bytes
SHA-256: bbe1dc3a32b47da79c9cfa0fb2e0b736cd247f69b6b2e78326df0dfa3a953990
font_02_sfnt_off00014c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C86 10640 bytes
SHA-256: 731d15bc832dda8cdf5e8b076a7d5868ac38c7f8653983f39c1edb61f489c7f1