Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e58ce7e0797eaf4…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 21:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3063cec20697ac703981dde27f2add16 SHA-1: a9546f653b114450f209caf87d43a10df34855a5 SHA-256: 2e58ce7e0797eaf4143407e7a8d07b856a950b89b8304a7ad9a395758f26a1e5
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/38008112077.pdf In PDF document text
    • http://web300k.com/upload/ck/files/kakipewojulomezewuges.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/kenolulazaloxebawidax.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/88ae561687d502cd845c6f5c31cfab06/92204356666.pdfIn PDF document text
    • http://www.db-ynox.fr/ckfinder/userfiles/files/33997194047.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/kigazunosewimanowilev.pdfIn PDF document text
    • https://la-klamm.org/Files/files/vafen.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2d425b8ed---molakizutozave.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076eb4ab19ac---47062278600.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/60915161183.pdfIn PDF document text
    • http://industrialdevices.in/uploads/80912802233.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/beloluwafutezipino.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/94064905179.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609448a4ac1c8---fuxopafo.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/88849730524.pdfIn PDF document text
    • http://vodnik48.ru/content/file/47698090679.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b11a2d711f2f29db4172bfbf51dae417/58606515363.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/70e7952582e7acb1afb2b0adbd9e1067/34529873120.pdfIn PDF document text
    • https://comfort8889.com/upload/files/50634642537.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b222908e1ff4f03320a70c2837fd8d69/86275935808.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/rezuga.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9f8e5204fd2485ae4e0e6490ce5ac0c/silepujevigamifakukowitud.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/20902990128.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/j9f9br544vkieemhjqm0uihr53/kosunegowigofekigi.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/36828019234.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26149714c8---22627595825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ipmat+past+year+papersPDF 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_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 10116 bytes
SHA-256: 970c209553440a854da73a6e3e153df1141bf3f03e5e4ce7a4b55d7187aedced
font_01_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 17972 bytes
SHA-256: 74779d0373715a59d083d992279cfbcca898c58e3b6e047017839c4f942877fa

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