Malicious PDF — malware analysis report

Static analysis result for SHA-256 171216e048113413…

MALICIOUS

PDF

79.2 KB Created: 2021-09-04 14:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fcb94890df8f7b9b8c65be23c0b9021e SHA-1: 22fc4473147f4849ef67578c2804e97f226944e2 SHA-256: 171216e048113413fb51bcf9afb6605919235977b22347a0c72c5dd98bdbf4b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and disposable hosting, masquerading as legitimate files like instruction manuals. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. While no scripts were directly extracted, the PDF structure and link farm suggest it's part of a phishing campaign designed to deliver malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://loscogliodifavignana.it/userfiles/files/97083685763.pdf In PDF document text
    • http://ateliergermain.net/sites/default/files/file/zisevejeti.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df493d8e48---48344822799.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161217c560746c---17825880216.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7cf3ed6f---ratopenexo.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/62064823570.pdfIn PDF document text
    • http://idroter.org/userfiles/files/27379592494.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/a218dd0082c9f23542220f283f4fb39b/xivitegi.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/14095885016.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/mijididexufaboxav.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/20297829631.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05f0394be7---vitepizatoxujugitotazepok.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///22315117275.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/97531703609.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/26282661137.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a565702380c---suvakobaxapamevis.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/59232717375.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ae486bee2e0b969e55fd0eca34fabddb/zusupenisafavewimuviwuji.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/94154094813.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/murotupiw.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/v4rvq4vdo8v1e966f5du7f0obk/14864976431.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/118ecb525692649e7fb8fb05eb66d979/93694367722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=volvo+xc60+instruction+manual+2019PDF 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_off0000d0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E8 11124 bytes
SHA-256: 2c7f6428648f3be56719fe2f8c4efd5720384d9b7388f550aea3d7bbf3a0f9a5
font_01_sfnt_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001030a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 17040 bytes
SHA-256: db9a00611be93f6ef751b1c94aee24fa00210845e911f50eed68533f424f0245

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