Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4ce6332cd1c04d…

MALICIOUS

PDF

87.1 KB Created: 2021-09-06 13:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ae80feb0cfd24f44e0151d87c8a5a702 SHA-1: 313e672c0b4ed5500015eef955607de1b275e9b0 SHA-256: ac4ce6332cd1c04d85bf3919bce9628ab92f4d0b5fd2fee9c211e2ccbb8a1fea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://garglob.ru/uplcv?utm_term=wish+you+were+here+guitar+pdf PDF link annotation
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/sg63te3hu8r1aetf4mk8v0kvi7/61756115255.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/44348316641.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/nojiba.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/kajekazirusikobuxa.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/7ea1f5bf98c86800b59d0f945b904585/bejigixe.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd07e530f---97675808458.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791a43cdce2---zesijovukiru.pdfIn PDF document text
    • http://domplus.su/userfiles/files/ruwixekakapupajuki.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609012f4b2e07---58511039302.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/boditokimamokom.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pif4s9gaqcjer7cv699krohar6/52680476638.pdfIn PDF document text
    • http://at1-turbo-j3t.com/contents//files/nowifupawelenekowakep.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/90962770072.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ed238553a---46359309917.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825b45621c2---xugogazizevomuravadejo.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/67477228032.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///56865576932.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/4866753856.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790c5bece5e---mufifasekenokaxuxonodoji.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/lejesafezagirege.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/4423203948.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831b3399ca0---vasuka.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b39734b3ac---birimenonewitosodofew.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/427fa41ac51d3845d6ea1b3880f5bee9/sojarazilisodegexiz.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160792c1ab4d5c---86463329335.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013002.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13002 18632 bytes
SHA-256: ee317408e6883e603ad2734353307cb7e3465a2ab953d34333c16b12e77e7539
font_00_sfnt_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 10920 bytes
SHA-256: 099f6b492f97000b8b08c5e5e25691ae9c590581bdf83d05cdc35e5d0695a19c
font_02_sfnt_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 17460 bytes
SHA-256: 3473793bd993496c1a9949a88aaa05da8394f779ab09acc3d59cab01839d8bfa

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