Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa57e56ceb90269…

MALICIOUS

PDF

84.1 KB Created: 2021-08-19 23:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12aa7e3563518f7cfddf5c9ef9c5ba5b SHA-1: 829af466c3665d077ef6a0e772416e742373eab7 SHA-256: 2fa57e56ceb9026998f2a224d901118e82ef437bcfc05e2a0d69ff45d10f14a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=cribriform+plate+ct+anatomy PDF link annotation
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/21ad1977fb4b18d8c422a011da5f2b12/91346951739.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/50628031115.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbe1e26d9---43372922307.pdfIn PDF document text
    • https://noventa.cz/media/files/file/8105539877.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40cef5593a---mokenamadezepukifamekepa.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/wobimakimap.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/surejivupulasabewajebi.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ef18f22dabe23ba9141c9a21ad221991/juwuwexile.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/62622eab1e17aa85dd753489f196e288/junonifutufovekinelonuz.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/46039938993.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/muriehujdrrpa3d7osn7jq1q37/gaxesutubekoxo.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/20925398012.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/45233635992.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37b3564846---fuzixojumidijufuvapudo.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/25aafa8827eba480c0ef492e9fcbbe0b/dikufidorukogadi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160700ce5f122c---95794748245.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e44c8d9ca---rukomazewemerasuzigaxanab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de3b9da446---10943945306.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/f3417bae87f014cb173df4cef18605d7/solebid.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/df46c1c4d395b4c6d0a1afa0c0db74cf/veliwupulemuvo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be314c6636---86715936867.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/gumixuwufidoxejedufud.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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 10756 bytes
SHA-256: b4471a397af611994c114147e852ab2d84d086335b6ed9c3619abf2a551fd2b2
font_01_sfnt_off0000fd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 17184 bytes
SHA-256: 549dc6ebdfde099013d6b16af61a9dc2700957b0f2c9d16e0748c243a16e1722
font_02_sfnt_off000129fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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