Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05b6a57f68de0bc…

MALICIOUS

PDF

84.1 KB Created: 2021-06-29 10:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 306fb4a59da1657576d0f9b39b567b02 SHA-1: 948e08af172100f7c3e88853683c1a8ab9ea10ea SHA-256: c05b6a57f68de0bcdb7b999c88677a60ead5655cf1d819d8c7f7e6dd8aec3d77
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, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/3aphq3pgmetb2d7g71icimi852/sijukomakopodurakowajomot.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/087e6425c48892c33706ba21bb271a21/durotabobegepaduno.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f20fa1aaa3100cfd36a87d1af38362d5/50273043753.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/77044eb83869afcbbbc31134cbd1d1f3/sipoxim.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c6e292b83---mivosarododagifibalus.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vmbhqj8p3rg913hcobfbl7rv5l/27359208434.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd4bd3cc3b33516715ade9c373f01689/zepesixopa.pdf
    • http://schmetterlingsgaerten.de/file/vukuromanexom.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087367acddb8---30871429714.pdf
    • https://tidurmalam.com/contents//files/gawapadekopovimubof.pdf
    • http://www.sport-konyv.hu/userfiles/file/6600074083.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e70bb662c7---59803263295.pdf
    • http://parzenica-bialka.pl/userfiles/files/29598305857.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e097c0eb04---pukupokizoguxefoj.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e1e0fd2c529d4811ebbdf2acd55722f0/fatudelamobofumab.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607da06fb03b6---58921852003.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160787ef298d8d---fobinuzinizo.pdf
    • https://unosms.us/userfiles/file/sixuxageki.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f383a4039b---22541300102.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5a833de19827bfc65cc1f1260c6d43f7/fujatijamo.pdf
    • http://provia-events.de/pics/fotos/1/file/27896270817.pdf
    • https://ludifrance.fr/userfiles/file/roganofokeb.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/13ea5a6d8bcb6c06dbaeda1efac628a9/xabirakizilasisiloranobop.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hope+is+a+dangerous+thing+for+woman+like+me+to+have+lyrics
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd8b.bin
a738314d7b0c0ea8b506cf320e0183703d850395d540d38c3627d3b64164c31c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 11516 bytes
font_01_sfnt_off0000f87d.bin
a8bd99c8381961ec8aa1a157f1f7e7d4cd9333611746ab7b33a0f5cab512ca1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 23400 bytes
font_02_sfnt_off00012a84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A84 16792 bytes