Malicious PDF — malware analysis report

Static analysis result for SHA-256 352bf60be818bc28…

MALICIOUS

PDF

69.4 KB Created: 2021-09-17 13:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 298603a19f4cf8cffc0809dfb20dc4fa SHA-1: 5ec28a1259ddd4099fbe4726c021366681f51e40 SHA-256: 352bf60be818bc289dca253c21f0a12aa25c44383a6d654dadd2b7e2bdeade45
176 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external links and the nature of the hosting suggest this PDF is part of a campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=antena+1+online+android PDF link annotation
    • https://samsunyapi.com/userfiles/files/mebupa.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/87045467221.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/87391003201.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/liwilasibojenemolezusuw.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/tamigemizabumagevomiv.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/13667797303.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/83415300828.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/fupivatelamitadopasejisu.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/dewarizojer.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/36002761190.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613734b6bd073---39925442793.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/26084983992.pdfIn PDF document text
    • http://cpviettin.com/upload/files/vavapet.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210915_145545.pdfPDF link annotation
    • http://yeongwonenc.com/userfiles/file/kesevaradajenike.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/44711228997.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/wixeposafuwozepadodop.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///velikajegirudi.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/bodevotisuxumab.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134953b0fd43---90609246272.pdfIn PDF document text
    • http://heizler.hu/files/file/kotozemex.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/30f081ceea6793326ebec6f42b60550a/23215925188.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/19985171916.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/1839193681.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/60671201642.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_off0000b34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB60 15160 bytes
SHA-256: c3c94601606f558e14c7acdb0fc8fa9053ce09435d138340c1c5a258bbdc3c2d
font_02_sfnt_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 10104 bytes
SHA-256: ae2c67be55211788bd71a21b528a0804c2039c0309b44d24a14169ff74e92d6b

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