Malicious PDF — malware analysis report

Static analysis result for SHA-256 0257a3fa59127fc2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 22:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 047a44798814184014666e17e2de8997 SHA-1: c703c5ef6cc292ceebc20145ded3bb0cd194af0a SHA-256: 0257a3fa59127fc2b9d3b4b4751f7dda7bf3f6265afa1afc81be861b7fcfb450
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=r2bees+yesterday+mp3+download+ghanamotion PDF link annotation
    • http://uceng.net/_UploadFile/Images/file/devesabewolemivawuximab.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/64884988359.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/rosawedexozolobi.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/20550635219.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce3aaaf4f9---niwunijupidomolileb.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/62970154705.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/50819033589.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/65795562231.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/43685780765.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7aba33ba470b1f1881039772c5747693/89212843554.pdfIn PDF document text
    • http://vaynhe.com/upload/files/lobolofu.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16097368d803e6---37668547278.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/xilotadepuvikuwar.pdfIn PDF document text
    • http://blatt-gruen.ch/files/zivarimomekelirupixide.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/972cc3c5fcf428823d12f1f6e960b771/matuburabuwekixoworupal.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/a30d41ea6e9dad4a8a51b6d5dc33cb36/befurejomupalixi.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/kiseloxitabarapake.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/lonepujupuporuboluzo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16077f64491215---mejijekonipepezip.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f7b520199---lilazujokoxeji.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/jatus.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6c5b6250f896a527ba5a138905be1be4/wukikexobevodagetixubud.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/vejumi.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f77db7f0628---lakedaxoputog.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/totovuwejore.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_off0000c9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 21004 bytes
SHA-256: 31367618ecaee01a7c414f163503e3f47a63914e8c13e7fe7c9c985993a9dbc5
font_02_sfnt_off00011803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 11516 bytes
SHA-256: 151e1f0b37f3bf3cff835b059e52e81b845bddd8aa94d23282639716505ec67c

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