Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93f00c33129e7d6…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 08:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39c7a5efbd5f911c794da6ca5b8f9b95 SHA-1: 15a35e606e4d9701c1a13d9fefa4d4658e1755ec SHA-256: e93f00c33129e7d615278bed596f13f4d4ac2d2be0cf44e195fc7528af94877d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://tdfstore.it/file/pimuwosoxamilidoru.pdf In PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/faxozu.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/65610437664.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/rasugarufixiwomebogo.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210912152558.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021090815570717.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135675cc0a88---12614334473.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/27091394996.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/68246251841.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/58518921180.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/karopupo.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/poril.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/90766499271.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/21515699202.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-3/20210903152947228908.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2b0d169c---dopemobufizigutudezazeme.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/bipubinexevufejonu.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/30769514403.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161323d8bf00e6---68208843763.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/82216726957.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/43345006428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=google+talk+indir+androidPDF 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_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 10388 bytes
SHA-256: 6304e5045a2670538bf6f3c231b90055475a73db1f2db2cbab8d08d6cb50b53e
font_01_sfnt_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 17900 bytes
SHA-256: d28696f352aa1a414ab89cab618d66153629d0aa648f2b0e3a5c347550306e9a
font_02_sfnt_off00012024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1