Malicious PDF — malware analysis report

Static analysis result for SHA-256 773b670862073b8b…

MALICIOUS

PDF

112.6 KB Created: 2021-09-10 09:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f8efa8c3875db46637483dbfb6dfa14 SHA-1: f33ea95b8a46228b106cdb5c372d6bb28043e0a7 SHA-256: 773b670862073b8b5a1f0fb475e730204082a5441d7127029ae3043e027d43f6
196 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm and attempts to trick the user into installing a browser extension or update. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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
  • 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://radio-salsa.fr/php/rs/filesupload/file/58651307288.pdf In PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/neserisolipowupu.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/lolitilijej.pdfIn PDF document text
    • https://nasikampung.info/contents/files/wovimu.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/fideboleravajoxuvukubuw.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/pevufalom.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/51538310310.pdfIn PDF document text
    • https://haidangpc.com/contents/files/zakewipaniwup.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/83163313265.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/85238438260.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161336f84618b9---44052216827.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/pifufigeruzazigexubaga.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/sulevumadizetafepujoto.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/11hkdhcp2pvbi6r3i1tjohbsg2/buxikelaxazesuzuvi.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/paxupesusufovuxazeji.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/pifufolomataxa.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/76951667391.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/jubuxufafusasuvezibexotus.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/eed97e2a6994599508e1dc8b416a7a40/6760989893.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/wemalanatare.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/76624873776.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/59264251084.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/tuziwivorelul.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/58940027056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=windows+10+update+corruptedPDF 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_off000154cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CDF 18000 bytes
SHA-256: bad462f4c1d9ea0d735230ee5665dcd4f652dbe6c1c3494e8da061ba45923fe3
font_02_sfnt_off00019b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B72 10816 bytes
SHA-256: 820d8a2acb835c3407015a8572211c27a1f536677c03b7dcf021d1628e05b197

Open this report in the interactive analyzer, or submit your own file for analysis.