Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fd95738195e854…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 11:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d63f390c29e6c658d7e3cd7e7f25ea93 SHA-1: e6baa7e155dfc500b3dfe17cc52235e7d25d7157 SHA-256: 57fd95738195e854cb25cda1771061681f441732d282c56dd3408fd4a217dc35
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress sites, which is a common tactic for phishing or malware distribution. The presence of multiple unknown URLs hosted on potentially compromised infrastructure supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/17cf6ddd6f38ca4bd37c8bc833054601/lujok.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/plf4gcnl72v479g7okqevbmrb5/lenatufimugarizetop.pdf
    • http://jinxinghotel.com/uploads/files/84810874845.pdf
    • http://biancoacolori.it/userfiles/files/sufenatunobobigeb.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/f0812437e9bc1ae8f82ef3fd43fdb7a1/41755962238.pdf
    • https://asthasupermarket.com/userfiles/file/41715445728.pdf
    • https://mangmalungtea.com/userfiles/file/640842769.pdf
    • http://geostudio.eu/userfiles/files/93788603274.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/8ab34b1cbf5ede3a68fa5c5a28eaf680/bekurukikatu.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a6d08029---puxozapabe.pdf
    • http://kasargod.net/uploads/file/winugifa.pdf
    • https://hometeamcorp.com/images/usr/pamidotirumat.pdf
    • https://chpcentre.com/files/file/68847530263.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/3a870ed49dfd0bce93e13410d4b61c8d/56407768347.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160afdda7030c1---gujoridapevuzidudolemi.pdf
    • http://ed-web.cz/userfilesfile/forugunokuv.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/72276c5c06e2a8593edb944e325d17f3/tufaxojozikogi.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608846a33faaa---jaber.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/634a4285f3545f4f8fdd93a26b69c9d4/65234819554.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/5463355082.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8dc7152c---zujokomezuvisomuvixeluw.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608d666bb186a---famuvetakixuxub.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/394c8cfaca112eeba4e85ba0ab12ac4c/zibegilodaxusebuwobale.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=new+season+of+the+witcher+release+date
    • 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_off0000ecbe.bin
03228476cd3b0313d6599c88e6848b26038ef248064de7d212b0441591990473
pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 10636 bytes
font_01_sfnt_off00010518.bin
70d06bbd69fb41709546d2fe6e86049295d80b58d961c5090ba97e8233148372
pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 17376 bytes
font_02_sfnt_off000131e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131E9 16792 bytes