Malicious PDF — malware analysis report

Static analysis result for SHA-256 b271257de6f9609a…

MALICIOUS

PDF

92.2 KB Created: 2021-07-01 13:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 68be0b12af646b417a806e80b8fa8f08 SHA-1: 1d39dffb91a634a2b9f8524273e21f8386924751 SHA-256: b271257de6f9609af4bfffd7409d2efe4f5e04d77f20476d7d013c622eec2677
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, many of which are hosted on disposable domains and utilize formcraft plugin vulnerabilities for file uploads. These links likely serve as a lure to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=sunapee+nh+town+office PDF link annotation
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb91a780493---17590743924.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5129c1804---wixowitapoboke.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/m4lsokgm36t68b5am8pv2hs333/59925190257.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d7b16d16b---kifexonavi.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/d0c61566f5c681551f07260a060ddbf4/tiwipopudagokebar.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15cd4b0a1c---muguferedoxifosig.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/g9edsggdjc0pi7thubm1q4fkbq/3360996691.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8b5277751---65563468996.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/zadaze.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077df64643ee---mepemadas.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/ffd8fb6cb0b0f0956392d7f2752117bc/tixufules.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b55c568ff---lolupawok.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/5e9b0438dec2b358d47654ee0851f0cf/65716645208.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa41130355---taruforebuwuvafapemazex.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a5f15b85e---wenekobogipo.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/rixolatuzewebi.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/rmil2lgjnu9i92t4nck4rr6orq/wizibaguzojifulob.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8d5e93889---12342093395.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/40324215592.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/66045542432.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4b69784f---luzajewerideradurosot.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/tezopugujepogobanagamus.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_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C64 17916 bytes
SHA-256: 136f40fa31c6bcc1809e5f4c04261f160271d76b0b5686bb5e7845e7368590c7
font_02_sfnt_off00014bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB0 10524 bytes
SHA-256: e1fd87d881e3f850e68d64f46d513d1adfa444d6d5d807ca26f7c62ec03da4ec

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