Malicious PDF — malware analysis report

Static analysis result for SHA-256 31292ea75701f3f9…

MALICIOUS

PDF

85.9 KB Created: 2021-09-07 05:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b01eb896a26d625842bad6639b2f477 SHA-1: 22d73ac85eafffd91641d3c0759f5436819aaa76 SHA-256: 31292ea75701f3f9e1c84e588e7a7528c2cca1ab6274a649dbe66729b612a20d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised or disposable hosting, a common tactic for distributing malicious payloads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method used to bypass gateway security. While no scripts were directly extracted, the presence of PDF-specific heuristics and embedded URLs suggests an attempt to trick the user into downloading and decrypting a secondary malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kis-u.com/page_data/file/20210618065923.pdf In PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/43742327256.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a9c266e955b40e214e81e5bedd6957de/61056283209.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fbe38627e2---lebefigozaf.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/bf29e253d6924da1ebc208cd272fd8d0/kiruvoj.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cb842124e---kebimabirofilitife.pdfIn PDF document text
    • https://tipresentoio.it/images/file/zovilak.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/kivojakimixu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3f440b8ea544b8f144663ba59f8a6d7a/42250870600.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/kojerekabin.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/wexomotunalidovogufumefin.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108040732521762.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/kelubisi.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/94747649060.pdfIn PDF document text
    • https://ecoretras.com/file/zovurevag.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737beb9c966---butunesawekupedafaxidika.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc62dcc2cb---keleperefanup.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/kater.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/reluzalogemokufopituvan.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/35d4d77bd997d10a3d8730c951d974bf/rojudebogufedizidafobin.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210814095350.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/36395093433.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ab4da4c6d---fatifelagozewibak.pdfIn PDF document text
    • https://kopari.hu/files/file/17277015783.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3fee504890---masawalopapemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=nuance+pdf+converter+professional+8+windows+10+downloadPDF link annotation
    • 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_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 18308 bytes
SHA-256: dcc5f264d4bfd9e4c80cf60479eb8c764f7fbcde490dad6c94962ff6b6f9bd5c
font_01_sfnt_off000116a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBD 11224 bytes
SHA-256: 210e679ac6c4d058d2137fb67fa9c76c493068316f000db7add4df090543ecc6

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