Malicious PDF — malware analysis report

Static analysis result for SHA-256 37190c9f4a3d8f9d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 17:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3423cfac940fb48c8682bfe1bf744036 SHA-1: f3a221dfa6aef631339974b2516a58d042e6b960 SHA-256: 37190c9f4a3d8f9d2661d34d60c3591c159466374ae246cffb92f59e7000534b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting and exhibiting characteristics of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=batman+apk+data PDF link annotation
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138b3a9e0545---vodewulaw.pdfIn PDF document text
    • https://kenadong.com/contents/files/jevafij.pdfIn PDF document text
    • https://casaalu.com/luutru/files/29387155801.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/76999164551.pdfIn PDF document text
    • http://blueyee.com/upload/file/051848041622.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/metalufemokuzip.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/dagubowidugadasorane.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/nutibijiwerilebojozut.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/xotuwujelarud.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/96932885764.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109040244537153.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16139f80e4d642---meneguzalexumozimokulegef.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/nofafotutejebepedavofep.pdfIn PDF document text
    • http://ux-school.ru/files/files/79179863531.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/22340369206.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/bawobagupuzigukipidagode.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/rafubenobula.pdfIn PDF document text
    • http://smogy.ru/files/files/29389386572.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/wisopi.pdfIn PDF document text
    • http://csp.hu/editor_up/sebaso.pdfIn PDF document text
    • https://coluer.ir/documents/file/71059447839.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/damat.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137551f79646---6450787231.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_off0000d7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 10040 bytes
SHA-256: 09481a5b201bc12c02e4b83b0454683e13dbbd018822203192b846817a76b131
font_02_sfnt_off000105ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 17492 bytes
SHA-256: 8e81430f82dd0f6b802ac043392629c7dd5f50e856869b1203feebbaae66c8a4