Malicious PDF — malware analysis report

Static analysis result for SHA-256 144f4b11cfbcd2d2…

MALICIOUS

PDF

91.3 KB Created: 2021-06-27 05:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 44fe7a84239227f160f183ddaa2229cd SHA-1: 8b71c52070dee49ed0a33a0eca460b475510e2ab SHA-256: 144f4b11cfbcd2d2975a59b48713cb538666bf98ba441ef97a6331506fb4adc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61517262518.pdf In PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbcf5555f9---74235678692.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c698e3d1e6f---pirapa.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6732a525ef---bixivelupokusojujojexo.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/52281795758.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cacfa5e80---dakuw.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e86b368736ea94bdee75ff7ab94e2444/salusolekipomunu.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/guzem.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/sizobudura.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afb453753a9---nuwebatixuregiti.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nijt3110f5c6v3ucpbcum4ggn5/lefesolizadati.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/63728930389.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/47879464094.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/daduzuve.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27e70cb7e7b8febd869bfce9cafe7fe5/16751431676.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f73c4706ff---levuxigisad.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/jifajanevifedapewedi.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/vegugewuwiperizuzitabe.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/2992420934.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/f411d45207888017f9b61ef6e268e616/94819820946.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072c3362f748---37194980351.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/dd01desa65oh47ridj9c1joh4e/50712194446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=medications+to+treat+hypoglycemiaPDF 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_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 11068 bytes
SHA-256: a21897e862cfdde5b530ff807bfbaaf762d8221d63b5f27c0beb336d96cd9545
font_01_sfnt_off00011a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13244 17396 bytes
SHA-256: 9d8dc97a6a7a66d721d21cbcc0ff0a57cfaf46b7f27a0c6f4cf76478ad255693

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