Malicious PDF — malware analysis report

Static analysis result for SHA-256 8341ca61f22c8c36…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 18:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b541e48e368fcee97a3500f7ea6f26cf SHA-1: fe0aed0b020795c7f85924bcdc553030244d80c3 SHA-256: 8341ca61f22c8c367df5346cee1824ca85c776fe528ac15f11084beb6c51e5c8
164 Risk Score

Malware Insights

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

The sample is identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting multiple URLs hosted on compromised websites, likely to trick users into downloading further malicious content. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://iwistw.com/upload/files/benumo.pdf In PDF document text
    • http://uran-berlin.com/userfiles/file/11371933566.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/67031386707.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/sibaletukusefuxaterires.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/44340369669.pdfIn PDF document text
    • http://tzsunup.com/upload/17541103794.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134e8d12e334---91352988785.pdfIn PDF document text
    • http://haki.vn/uploads/files/jokudu.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/xovaw.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130963d05773---dizasurudirapulidedo.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/27072134523.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/5619351154.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/60777218749.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f330a2b47---zabuvarabazipobewijotu.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/63070663531.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/2986058316.pdfIn PDF document text
    • http://minipit.com/data/files/65111559215.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/kevox.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/xilisurufepof.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/puxenogiguje.pdfIn PDF document text
    • http://halaljones.com/uploads/files/49171528170.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/kugogadun.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/22425835356.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/4pj0mh6c6jktg9l33qlv27jr7h/55673163276.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af4a72b03---64957168566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=boruto+dub+onlinePDF 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_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 19000 bytes
SHA-256: dd69b7716c93164ab07e8380c11aa5fb19939560e4498b9cc3f0892781edfbf8
font_01_sfnt_off00010f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12769 10204 bytes
SHA-256: e7a213e4e9510075d8239c61d48809236f7f7063bd990c4dbf084b4b229376e3

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