Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a0bf591b869a96…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 00:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5c860fe9944291af5b9559e02d190131 SHA-1: 9636b3339e1b0b238cbc6903a9dbe3ceea45b1e1 SHA-256: 83a0bf591b869a96fbfc3b8d3b94a10a509458ae84acef7c9b7dc272954bba3c
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for SEO poisoning. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading further malicious content. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=how+to+install+prime+os+on+pc PDF link annotation
    • https://cartolmania.it/file/1815050773.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50771259104.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/kupemawomojokam.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/rarovejuzepuxuludu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16136f5bc21f92---zememutivajuluze.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/10713412837.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/46211504874.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/33476164851.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/tawovutuf.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/32868363737.pdfIn PDF document text
    • https://alutat.com/data/file/91349340732.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613480b447400---zelenamifilaba.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/34447261767.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/porisukuwovulo.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e7ae9dea8---bisuxukunowebipebej.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/19amra1omuf7h9n4jh3epolm21/xisozuru.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/12659206501.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/xisaduzozabuwobarib.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/66219886280.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/bivorexugedel.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/majaxiliwimafimojivavek.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/beros.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418bf96afe5---vesud.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/xojel.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_off0000dbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE8 17676 bytes
SHA-256: 58896f0d98ceac11f8d657e72244bfbe54523877895dce67465cc3ba8929f924
font_01_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A4 10612 bytes
SHA-256: 08c4959ee5d19e6d70536731d6bd9d43b34e5cd79ae000857127b60dfeb9d525

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