Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78dbdba95134ceb…

MALICIOUS

PDF

85.0 KB Created: 2021-08-18 18:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b6d2abd1fd5cf9f34c8753f364741f9 SHA-1: 3e1c85ed6cf38f9d1967e84216132040e59f30b8 SHA-256: c78dbdba95134ceb19cc737f885b64a06bc137906b4901b32b49e0e55ade5f0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the embedded URLs and the nature of the link farm heuristics strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=how+do+you+cook+frozen+wings+in+a+ninja+foodi+grill PDF link annotation
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/nemshasbs98flv6c8olrkftdit/51204315094.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/17fo8c8uhlkfnnd43v3bf7ebvv/fovinofodoserilupuworifij.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/476476477252db94f8cd39ed07778221/16333595657.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/c64a987027cb5bbbb8d39923ed240d50/67134199372.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/95505452422.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/zeberamavopuj.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/motabememaginisoluwezewe.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3bd535cbf20a59a1dbb19bf796c171a5/3660007599.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/qp7jqn26eclg0u7lan9f9vnft2/37319359198.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/48923178745.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/dakerawa.pdfIn PDF document text
    • http://keramann.ru/uploads/files/98965395900.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2137ae9a1---xuzigolalevadulitaxow.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/leturijogefit.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16094333396693---12798612970.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e2797207c---75903956013.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071841ab16d8---29797924295.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/svg1rpsuglilkg84u13al5tro2/68193568019.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc19dd1f11---ribira.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/tikulunojafegogusikakab.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/33542104047.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/fk2sekpv791chjtsva9c13pd2f/doviputuvonuwe.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/kekoraneko.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/wuzarepuvizagegi.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210818_45CF93C12E28C60F.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_off0000e7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 16888 bytes
SHA-256: 654e7c13ea5f19d77b121b0b058f252c030cc713d7776c7cd07993fd3c51a9e7
font_01_sfnt_off000113ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 11124 bytes
SHA-256: c362f409994fc6b518da5bc58c2f49615d07ffc23f9b85115e9253b6ef6b8a66
font_02_sfnt_off00012d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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