Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a633a4a8cca28c…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 17:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a3e0dcb27dfd52879ea57bd45cd0ef72 SHA-1: 5badfe162f7b3dd20a3a8496c81ff61baef1e93d SHA-256: 36a633a4a8cca28c05a8c1dedca882b8e3b17c7ced591b909f1cdc1334d4e066
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, including compromised WordPress sites and disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate this malicious intent. While no scripts were extracted, the structure and URL patterns suggest the document is designed to lure users to external sites, potentially for phishing or malware distribution, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://poltinka.ru/userfiles/file/sapijisosojederevibi.pdf In PDF document text
    • https://serwisnawigacji.pl/userfiles/file/32177324401.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/15301051730.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/lepuvuzotetel.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/dfbe78599b218994d3939b1c88b3ee4a/rodebowifavevafuwo.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/numogosefetobopemevarinaf.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/8p0s7fijtmjrmgitlj73hhlru2/74804589252.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/52729193895.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/bosefoxegino.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/78163334018.pdfIn PDF document text
    • http://chinazzjx.com/d/files/80030716085.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d9fc025a9---wanatojigejavutefodiseba.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a959eabac3---wuwigejuzinozev.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/59661465192.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/rejogapol.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/l6ahfhlcomcl5vm0t2vpbi3bqr/rivowanupimu.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/50122593091.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091d61740def---68589241378.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65686ac7e9---vuwutumosabiroda.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/zizuporiraparavurufozukuj.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/5528cc28f3b5912654a97ff4a4fe272b/10034281460.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/wibegurovofoladakaxigo.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/xikazedozigesijoxena.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/15884360948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=product+of+meiosis+iPDF link annotation
    • 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_off0000ce30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE30 16644 bytes
SHA-256: 6058523c7221beee801c4e53fddfc9ca67fb866c431a07a4bcb484d261b7be6b
font_01_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A4 10428 bytes
SHA-256: 37b1ead4c10c212a09a074a249862cf767aec5adeea2ec33d4524c243e945338

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