Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b0fd95f470ea92…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 08:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 066bc57d266f38d82b80b356f61e8be3 SHA-1: fd0b10c5648d6ebc6835879e157ef2f20c72ddcc SHA-256: a5b0fd95f470ea92c48076615a0fecdcd32e119c6bcd15724871c224115445af
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to lure users to malicious sites. The presence of external URIs and the link farm structure strongly suggest an attempt to redirect users for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://sro52.ru/uploads/files/dewugaviwazub.pdf In PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/adc0def076587505447276c322b6afcf/sufabilumifijosupubuno.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/piethjf0rtp4br4qalodvnnvc5/52608286861.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/bdde78140d6eaccc23a69e8e12d098a1/40711635531.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/3892707267.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/97043048053.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/60815745536.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76620034521.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/dujuworixifitokaposaj.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/e26nkb1uihvhestfq2jruaea30/faxosak.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160750351cf8ab---57041205880.pdfIn PDF document text
    • https://songhongresort.com/img/files/meripumaviloleritofijif.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/17642660071.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/311a0731b67f941c861356185d848083/96808632193.pdfIn PDF document text
    • http://bfo-walkforhope.com/clients/e/eb/ebd0efab9cd97e953e90891d9eec7aad/File/gotenexadijebirikexijunal.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/fb73d8852b04bf34ae1f5b04c1f18a71/73668824973.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/vqvje545f4rr95thei85qsubqq/12535796046.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/julinibuxujezelotekila.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985fcb89bb1---woferikavuvukumijare.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/vedopibilofokol.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609f05bea59c8---41912951222.pdfIn PDF document text
    • http://biomisszio.hu/tmp/bajijuniniladadizaxixesu.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/5400309339.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/vupunosim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=statistically+significant+change+over+timePDF 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_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 11036 bytes
SHA-256: d024ab4b78d094d2b582f4d4356d601d5db0b7dbfb66f3c5dafed016e304b340
font_01_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 18944 bytes
SHA-256: 76c4d5d30e3abc1c145c9d9e406e782f32321382174f8b1fadfb612b67c6b36f
font_02_sfnt_off00012b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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