Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e85956b3d2bf6d…

MALICIOUS

PDF

94.0 KB Created: 2021-09-05 15:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e47f2917601693dd168dca24dd16e0a SHA-1: 12e9875a684e3db5162544b1f83979f79d388448 SHA-256: 33e85956b3d2bf6d5d4be1a0b11c0982e5759481b7450fbd9272db39fe55ed1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute phishing or other malicious content. No scripts were extracted, but the nature of the URLs indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://catamma.ru/uplcv?utm_term=group+communication+definition+pdf PDF link annotation
    • https://ngusacdon.com/upload/files/4314283610.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b625f254b---xikajedigipatexamodupud.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fsmuegqk914pntniaigr82hk2/69829451531.pdfIn PDF document text
    • https://bangkoksolarpower.com/syner_upload/images/files/gorifikoririgevixig.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d2e77c9f0---tirodazijulavosexezibi.pdfIn PDF document text
    • https://777mto.com/contents//files/vaseniwakedavidefeje.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/limupakutogin.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/64105126913.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/01120d7f8b32a485d56c97f0829bb256/47590408581.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/18081774397.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/46825779374.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/2833d842178f0cd354448d262676843e/kukovulagokufisukuxowafa.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/doporolarowelemimiraker.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/74873249989.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c15bad4252---78213001700.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077856a0b512---28325681970.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/kaxudi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bce20439ec4---revusopasogiliparoxaf.pdfIn PDF document text
    • https://people11people.gr/uploads/File/jejegusanik.pdfIn PDF document text
    • http://ccshecea.org/upload/files/soxarupusopubidunewaxalib.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/legizekub.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b41bc5dc6beabdb202d755ba567661d8/jojebevikubixavezimon.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a09e6dc274c---kapax.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/63271623229.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/fobero.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_off00010c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C99 10708 bytes
SHA-256: b4ae6156652682801d972fbbc902f43a19b0a8ab402aa657eebfc2e9ab1c98e7
font_01_sfnt_off0001252a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252A 17432 bytes
SHA-256: d4ae79c680a08f858cdcf3d7fcba7965cf8a52a91ff8e8b6e5eb77281776334c
font_02_sfnt_off0001526e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1526E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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