Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dab34dbfbfbddc2…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 10:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2ce590aba8a707ae43f59137f0c81113 SHA-1: c4ccbb6f22928125b94fd977e1cb5fd1833c7c63 SHA-256: 8dab34dbfbfbddc21708c15e7821d8b85b3b0a6ba8e84c9d985c927051460f14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and ClamAV as malicious, specifically indicating phishing and trojan activity. The document contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=cold+comes+the+night+review PDF link annotation
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee445724e5---10237195273.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/54416839590.pdfIn PDF document text
    • https://tigapilar.com/upload/files/nudiwi.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/62369770964.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/52101700162.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/ninurifomotod.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/21143579531.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/xanisuserajekemag.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/4039029794.pdfIn PDF document text
    • http://webs123.com/userfiles/file/90169983571.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/c7271d3c91db296ed05af75335f8668a/34727649942.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614af497e114e---sakarorubule.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/92720797222.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/17397094418.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/39329699789.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/44732652872.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/koretogitasidosapoza.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/fadolibanifinefode.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/28811228986.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/221634596276.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/33163628727.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/57583322201.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/nakijuje.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e121aea8d---49589534161.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_off0000b30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 16244 bytes
SHA-256: 1bb50151d0c98ef42141bfaac0f15d152be6e15fd629c52532a4c04e8898f461
font_02_sfnt_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 10840 bytes
SHA-256: 430ec0d2168192f7ad8440038a9572390126e9e3ad6b7023ebaa34e89f10b067