Malicious PDF — malware analysis report

Static analysis result for SHA-256 85af19c06380dad5…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 16:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1796b57c5cd94886fc187ea6e14f4b0c SHA-1: 02e6b05f8f4b74c7af229f1c8292d57bcdbba56e SHA-256: 85af19c06380dad59ae6120377b175140142d58a0eea443ff0c89a662d28ec22
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the redirection to external malicious sites.

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 https://infrive.ru/uplcv?utm_term=anger+stick+mod+apk PDF link annotation
    • https://goodnest.info/tctt/sites/aaa/file/2428462265.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/zukule.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/bejif.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/novenoniwalofumebunoni.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/2703566556.pdfIn PDF document text
    • https://stormester.no/files/file/22083438149.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/2033649440.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/13432248680.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/39934627281.pdfIn PDF document text
    • http://soupworld.de/upload/file/24971525164.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109010804333069.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/nojorekujedafeserezis.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/78132779980.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/vizagafosavugawawexapid.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/43a4570f5986e52e82a0eb344bc065cb/mozosokasopivakezoxikuzur.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/vumetefaparisugozizosok.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/59576940999.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef73245532---62039057978.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/88843692313.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///18640354023.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/5348396717.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/738e1b5795b3dd37b29d3b3043e27f65/77235463987.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/vijupuvuvisesagudefid.pdfIn PDF document text
    • 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_off0000afda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDA 16008 bytes
SHA-256: 17dc326c9bb83f8167bc7af894fd8a731709a6425c8493b3ec83912ea16099de
font_01_sfnt_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 10884 bytes
SHA-256: 54494cdfa2e375cb37d4b53fd0f248b28472005ab7daf743c9c8ef0a44eb573b