Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3a6c907986bb0c…

MALICIOUS

PDF

81.7 KB Created: 2021-10-22 16:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 74e013f275fa0c3e6df1eada5100a9ba SHA-1: b03bd541702010c3d20bdd1518f5ff66c080d4f4 SHA-256: af3a6c907986bb0ce51ee4f1a5250b8ce2c2b513860f4085bda98b1d188fdf13
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics further supports the conclusion that this document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=deferred+payroll+taxes PDF link annotation
    • http://simsvizag.com/contentimages/file/fezixota.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/sixobu.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/ponawiribedavusus.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161fd1883f34---mofupelebuvepo.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/65738872752.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b6f41c455---sazirikixux.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/89102797140.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/nakelulu.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/vasivefusatelepati.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/rejodavup.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/juxuz.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/muvaxo.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/57784379726.pdfIn PDF document text
    • https://phnews.ro/files/file/96744766247.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rezokesinavuwim.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/vovamafokubuzibujoloxul.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468eb2b4a1b---4468255039.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7iqfktn8622gjk41f6220h7v99/sinunimumibejote.pdfIn PDF document text
    • https://medicraftindia.com/uploads/file/7716342624.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/gudizutefim.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b4aeecc69e8f1a48e3242e44900c5516/novug.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/teweduvoxuzemo.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_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 16772 bytes
SHA-256: 6248e0f1b6efd937d2ba47ffead0fd43e2b0a2ac17fe1ff63040ea3286ebff41
font_01_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 10512 bytes
SHA-256: f2268acb80e2107baa8fb72cbbbf24f166f5eaf9245f2629eebaa03098a9f543
font_02_sfnt_off00012112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1