Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9994823639b4af2…

MALICIOUS

PDF

71.0 KB Created: 2021-09-24 20:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 82aa94197adcb126b3a60c1656d968a9 SHA-1: b7d0222369bf47565782f5b82d52e682ae88da3a SHA-256: f9994823639b4af2df6f6f28c2cdfff55d36a913c9f2a6a8e8a247b24a1e2d37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/lv4hh0vaskqi1v1c3tg4ju445j/62358186867.pdf In PDF document text
    • http://dorp.pl/userfiles/files/foxagenigawakutitoze.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/narejenobarugadezozutawuv.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/36626855005.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/52883252292.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/vujevanige.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/66712583117.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/c0fe37331a2bf3ddfd084154357d2ba3/zimuzasavomovapo.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/63322903301.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/d97eb7d3989c213b539533100793331d/dutunebovidizovosowes.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/gigebula.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/5249844509.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140965092667---zubugidezitabozobasesejig.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/nefobibimadubatapotuga.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131710b6d666---98581643600.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/1745168863.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/kafipizenivi.pdfIn PDF document text
    • https://network-italia.com/file/50903879131.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/nezenu.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/gimesufunijaxinubevefufud.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/xoguzigemozekubidexoko.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/20538529738.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/fonotowelegob.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/zodufeme.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/14ad7dd32911ea0a8901d914d3209eb4/befezili.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/polesev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=gta+5+money+glitch+pc+2020PDF 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_off0000b2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF6 11080 bytes
SHA-256: 306a5a0fbbe23504c250db0cc7f8b1d63abc4d75b8ad75d4798b7f6078627483
font_02_sfnt_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 16460 bytes
SHA-256: f51fb3a8356e4c60903c4b8532e93f6f7a7e640b61fc77ce38f633f379857870

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