Malicious PDF — malware analysis report

Static analysis result for SHA-256 c360977b9226d670…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 07:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c31aef068a29559d654671b156df9455 SHA-1: 22628c6b19de3c461aa3199f7a117a0b0025f98a SHA-256: c360977b9226d6709a94c3940a883ccf6aaa65241e933c3c892bb37e80959f22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it's part of a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=cataracts+in+humans PDF link annotation
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160899e32b9816---46223460827.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/ravukejejeritidira.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/27956953721.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/4896497059.pdfIn PDF document text
    • http://headrepublic.pl/images/files/338145158.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/limabetur.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160833b9a24a5c---25685828784.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/numut.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/68635767566.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/vanus.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/safarumepegobetoxumuridev.pdfIn PDF document text
    • http://coffee33.ru/archive/file/70115912834.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/41417960761.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/1c4b639f44952b9d7b6c3f133b5222c2/xuroju.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/9581656458.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/ninepasinitus.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/banirotujomajavebokiwig.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/fotugede.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/90811059900.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/osaul3b13j679tdq4pd9e75rqe/21571876720.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/pozevuzanuzug.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080650828c09---zijiwinogebenaz.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746177a6cdd---bebugebupupujutupukukog.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/nige0uog3hmri97fc9257fapjl/mikosamogazupelinixoguzu.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/rujodogipopetuzu.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_off0000d3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F4 10328 bytes
SHA-256: 3d996ec3280150214a171e7feeb533d5955c1dac3ef3f0b434b95dda64fc8add
font_01_sfnt_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 18516 bytes
SHA-256: a4461009bd1dc6429ca48bcf32e096bd80222e04280bfa832e7ad78b80bf9d10
font_02_sfnt_off00011b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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