Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db4d2b3fdb1c9af…

MALICIOUS

PDF

72.0 KB Created: 2021-09-05 21:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 17a3739025fad72ff6fa2ffa28864e91 SHA-1: 82289e10ac00ffbc744e90252fc6937cdae86079 SHA-256: 5db4d2b3fdb1c9af47670d9fe8bd340521714d090d6591cece495f8bade980d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. This suggests the primary purpose is to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://blackivy.pl/userfiles/file/78337355462.pdf In PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160780777803b4---luxujureb.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2fc0828250e40082faffeb0125a03c4d/tiloser.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/tojexelujesoxufutivuta.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/guvafutot.pdfIn PDF document text
    • https://vientangluc.com/upload/files/61913517642.pdfIn PDF document text
    • http://bushurov.ru/images/files/tubidojalasanetux.pdfIn PDF document text
    • https://nadamasristorante.it/file/biregiwowuponufipi.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/paxulawebegim.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/40221674470.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/98840949625.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1a4ef2e32---nevanif.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/97541196561.pdfIn PDF document text
    • http://darstin.com/userfiles/files/zovifelixizaxogawap.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a8434e5f32c66032609dd0db67afaf82/nogilikanoxiposogod.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/83631989015.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7f6e3c7206c9bf5958b2d32ec985ed1f/xeluzipobanasona.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/77135314961.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/86287444483.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/dujcoaq3icnf8s0o7ej2deg6ph/semafawado.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/vegorevewozaver.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/foxodopo.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/7c611c9a1f073cdc0f7738e0cf412fa5/9051486692.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f0985c272d0---suvimerezudarurike.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a59ab6cba23---bunukojejugusitar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=file+pdf+convert+to+wordPDF 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_off0000b8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E6 16436 bytes
SHA-256: 0330ab8f4a71a7225df7f954709a4a09a5dc23629bcaa9a8ea67bcca457ec56b
font_01_sfnt_off0000e2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 10412 bytes
SHA-256: 8a0bdd5813046eace1f69f2b35f4111dc2d81ffee3406109b8d8f3eb4de8d2f3
font_02_sfnt_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1