Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2709bd6abf8e6f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 13:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d2169d94697002b15fb228f30c7aa4b SHA-1: 4b015a41b285dfb9cf23863183db3aa613e442bd SHA-256: de2709bd6abf8e6f265c503e9110435e33faf9c6580cd98b40e9aff266c17f8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=good+games+to+pass+time PDF link annotation
    • http://ssaisarang.com/ckfinder/userfiles/files/pegasawumunowiw.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/bovanorulasem.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/48651977110.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/1131713173.pdfIn PDF document text
    • https://haidangpc.com/contents/files/baguwisod.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/12682907908.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/52182724061.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c7cbb3b8---luzedede.pdfIn PDF document text
    • http://gibisch.com/files/files/2005366919.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/80960717257.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/95910260261.pdfIn PDF document text
    • https://masukpt2.com/contents/files/kufusiridawimiv.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/41947519533.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/rupakavisudefotelowox.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/93524093299.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd138bd12---80669116085.pdfIn PDF document text
    • https://cecprint.com/images/file/82273268747.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a9f9b8769118946cf2d1f064d44daf8d/xabuveguxogopinufe.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/xujoroporapivaseta.pdfIn PDF document text
    • http://bubb.cn/up_file/file/69815805524.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/datelewupajakobagogamure.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddc8999e7d---wuzibomurawarawak.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/13268530742.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614140363f1c3---noraguwuforukaviga.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_off0000dca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 18336 bytes
SHA-256: f1c964211119b98544f4fb1bfd17983b7b4576814b7f49552cc167d0c0e6d27c
font_02_sfnt_off000124ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CA 10524 bytes
SHA-256: d26d2030a4e6e5f452f2891c41a982688212aa359f4882356952c4c5c1642406

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