Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebdbd5ccc0cbbf5…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 15:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a8bc4bcafcef904ac810216f3e44ef7f SHA-1: 6347ad0b560c6d5e121870a694025bde2cf2280e SHA-256: 5ebdbd5ccc0cbbf5ab005a1840d43120364bf4261300a05ad4ec22f61e0de21c
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV confirming it as a phishing trojan. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The document body is unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://opakowania-loga.pl/zdjecia/fotki/file/96209179254.pdf In PDF document text
    • http://viettranslators.com/webroot/img/files/veviwiwasogedofuxazodop.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/88414276230.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/94236657930.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/14290146255.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/kubon.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd9b455755---51272992998.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161103bdc63463---19045452577.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/162e6d278080f05120d240b4b66b50ee/95485898322.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/372dafc4f7131a7cc8a031a4ebc57fd5/18026091135.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/dha7l6vc91ies2duv7b0hv6lph/52752108765.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/xamirufubomerofag.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/jasikawexutumunoze.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e55d54f911c54e6ea5468388b19b5cef/98473309757.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16115175ea5b9a---dawogilupolowotokesagop.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae3729af8---rakugaze.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089da9d78e35---90849557345.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/jafafoxikuwipiles.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ab265a25d---13022847335.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/88614232302.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/xulegakarijekuvadex.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608d561a091a4---59612863398.pdfIn PDF document text
    • https://pindimana.in/uploads/file/23572796964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=diagrama+de+flujo+de+proceso+de+operaciones+pdfPDF 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_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 19364 bytes
SHA-256: ef6c6add147c6d6386331552ffffc64378a9013ee0e4d596b9682bcbe5c25e2e
font_02_sfnt_off00012da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA6 11096 bytes
SHA-256: 656f73fffae79106c449b7b5887b40e01e38e20b9c5d69b3e637e32730443b34

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