Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6dd677510d62f2f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 12:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 836afdf62aab97ac43231ff487c7cf95 SHA-1: 41b845e88a298cb136349783e947805033772704 SHA-256: b6dd677510d62f2f60fde36b051c8a9842a40bce3a799537ec29ba8bf63e90a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of multiple external URIs and link farm heuristics suggests an attempt to distribute malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=present+simple+exercises+worksheet+pdf PDF link annotation
    • http://www.parkwaytransplant.com/media_upload/upload/files/71069098877.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/riwarafukagejufafigas.pdfIn PDF document text
    • http://tw-go.org/files/7648752359.pdfIn PDF document text
    • http://seamacros.com/upload/file/18995916233.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f5fdeea56cd---fitijotazeduniwoz.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/42193351521.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/todagenofetugobafisadexuf.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85d12e2934---wipuman.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/68087448008.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161330c055d817---36073716882.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/45b605c199adb3beefe02e90a27398a4/mifiwelakewubofubijudiset.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/safutefatewelojobuxale.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607840d6a342b---sokupijaferarali.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/60437150859.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/22099656404.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/mizetidujedo.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c67a83a0---56767241727.pdfIn PDF document text
    • https://htchninc.com/d/files/81715125720.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/a039540bcfd3b2886b95989d57846962/nazizunopibakuzalivuzatoj.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a632879cb93---19713388510.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_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 17532 bytes
SHA-256: dbe97f5da2dc18913d66b14f7587a75b91a152194edc558d3f11144fe8ef7122
font_01_sfnt_off00010a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001221b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221B 11004 bytes
SHA-256: 92a392f7f935a69cdec62af1a1e1df10866d91b267539bc3cc1029f7219db14e

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