Malicious PDF — malware analysis report

Static analysis result for SHA-256 48fe771aaf7b7e15…

MALICIOUS

PDF

102.0 KB Created: 2021-07-14 04:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa13b9e4879547255adfde2368cd9aa3 SHA-1: 19a861543b9b1cf29c7dd0ba00c615d63589ada9 SHA-256: 48fe771aaf7b7e157bc89e5e317a6d32f749a9d70bf3b387733be060a242feca
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF is a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The primary attack pattern involves directing users to external malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9847

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://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/93266877882.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/n9p45r8pe6unnn8v402rcqm4e6/rimataxuragi.pdf
    • http://sgd42.ru/userfiles/file/30770339006.pdf
    • http://meble-tk.pl/userfiles/file/57910857870.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608406cd0bc31---80745998655.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a0253b8203a8b1282da4b07764ceb22a/sufadidivo.pdf
    • http://madmojo.com/fckupload/file/parulokowilikebibudejuk.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9be8f9e0cf1afc8ac32d713ea4cefd7f/11250846672.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/0c7518fb98014ded7f36280b8f9c24f1/1550869692.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b79148b88dd---31320933166.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/ba8de462485ed75b5f8362dd1ac451d1/sumobasukezufasibabaseviz.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ebc141c0---ribizozamebivume.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/d8k556dddl7o45f0h3icaghr2m/rewetij.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/taligadevutanim.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a85d75d7cf9fe207ce7bc12e42d33ae0/53910054791.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dfc0871d1dadc7637221164f510b58ff/bajemaxofuxu.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ded78b4a904---29045818034.pdf
    • http://orchid-daikanyama.com/userfiles/file/69287674181.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/1790643ca4aac873bfbba04cabd262a7/sebasusepugo.pdf
    • http://svaz-podnikani.cz/files/file/49419809352.pdf
    • http://ylpqzl.com/ckfinder/userfiles/files/bapebudutape.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+many+mls+in+a+standard+shot
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105d9.bin
9582160e816df357dd4f86c3cb696f96e80d15a4774f42afa352fe221958ddda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 16404 bytes
font_01_sfnt_off00011c6d.bin
410d4ccbf4eb07d8c93946399b24b00a31bfb68d245ab605af78d59c159a1953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6D 20632 bytes
font_02_sfnt_off00014f90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F90 16792 bytes
font_03_sfnt_off0001679d.bin
ee4fc9ee6d9d14377d851d2f8e2e8952a7a88c8fcd4629bceb3e01e9a4d9144b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1679D 2316 bytes
font_04_sfnt_off000171ea.bin
9c0fee609da163fe40c7fa4d88d89ac6ac66348dca58aecb49545b9c7b405041		 pdf-font-stream PDF embedded font (sfnt) at offset 0x171EA 10572 bytes

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