Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d098e3e835c5f71…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 12:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c2cc19ee5f1836f576ed1e8bef82797 SHA-1: 46439e8426f075922cc247995ab5b584174a6ff9 SHA-256: 0d098e3e835c5f719d7dfa71a529e87c77dd18c8d4f9a065dfb6f0f8c422f8cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, likely intended to lure users to malicious sites for phishing or malware downloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://philabc.ru/uplcv?utm_term=the+night+eats+the+world+streaming+ita PDF link annotation
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/89024827865.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/97444770900.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/28990610223.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/zetezaditudatagodexajofa.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/vegazuwowotuweronud.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/rinisugaludazena.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vp7nl6clslpo8525tqsivrdvss/buruladariwaliwa.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613292cf248bb---83894007269.pdfIn PDF document text
    • http://orenprom.com/img/account/file/52867714362.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/95253671975.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/xagetig.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/zenupusefuzititetaba.pdfIn PDF document text
    • http://doina.md/fckeditorfiles/file/zijobajaxifug.pdfIn PDF document text
    • https://novsport.com/content/File/627208908.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9639473dc117630becb0c5357fcbbac2/85089996511.pdfIn PDF document text
    • http://pk.mo/userfiles/file/60317023210.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/wuzogabogir.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/dudepili.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/3088873557.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/43652203582.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_off0000c8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BE 18032 bytes
SHA-256: a21d4dc364ccccc09e1f1e0e38ccfc7ecccedf3304ea235e4031e4ad4d86f4f1
font_01_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 10744 bytes
SHA-256: b61f93941265d4e1df4dda4e19db1a7686e914bedb101a561ecd28ebbf8933a6