Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc0e5311a67f965…

MALICIOUS

PDF

166.6 KB Created: 2021-06-11 14:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 214a6acd774738afed46d3038f617cfd SHA-1: f7639d6e836858c795c0587986069bf2bb5497b5 SHA-256: 4bc0e5311a67f9653f71a6cf6abc2bf2e2da2f39299253e66e07770684aee229
154 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, which in turn serve other PDF files. This suggests a multi-stage attack, likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9731

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=d%2526d+player%2527s+handbook+online PDF link annotation
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887f3a18108---zidakilese.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/nunapakaze.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/kepexazixagadam.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/abrah98p6aj2hea5bq4m628o16/tazalagamodanapam.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9d94ceb69---javuwasakofi.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac930ca97fb---lenujixole.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/tohjblqqj4mvdd1p202k5684ce/xademagofatax.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c298ba52be0---89648560925.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9daa16685---55980438934.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/47841726144.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/449b2f4b1a684c717e076cb243da0d01/gixukisazemakifefid.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/3405045719.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/cqidb2v9q7e65eam70iq0gcue6/82777050832.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fffd5b8015---dedag.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/ledijexixiverenop.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/de0cv6b4vic5a965jvrh4qgcbp/29530791777.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c609a6f82c---gozozaxozegexalezimuwuto.pdfIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00027e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27E1B 7516 bytes
SHA-256: 76f34301b0f0f3260df63e8e06ee417912ceebc1ec9b161224d906abd4afa021
font_01_sfnt_off0002919f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2919F 3148 bytes
SHA-256: 3d18dca7e3151ab78b523ac4104e86b88c6789bd7feb2b9d7711bf9cdfa03466

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