Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d5983c3d741ad8…

MALICIOUS

PDF

84.0 KB Created: 2021-08-20 14:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 522304bd805b95528e237f00254b76de SHA-1: 66a344c9cdff7c616e1db91cbea96eed02c75e5a SHA-256: 22d5983c3d741ad86856293a7afbc3cb6f410f5d501c94ab36fa2064b2d1806b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://medvor.ru/uplcv?utm_term=10+rules+of+active+and+passive+voice PDF link annotation
    • https://festival-bg.com/media/ckuploads/files/99144901086.pdfIn PDF document text
    • http://utopbrake.com/uploadfile/files/rokodatomodiviputevuga.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/digavaj.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/i2g8cdk31jq7abi0e41hkq0s61/dofufulatumofebamigob.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/birinudokubipukolit.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/fa9d8f88707cf8ed673577ae2e090d9f/dolinilajisawosura.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d54259caa1---zidalotej.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1391ps15bidpfonlrf9ikj65s6/92692361428.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/tixorujoxeju.pdfIn PDF document text
    • http://lg-palette.com/upload/files/63131367392.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9524e173cd---90514820333.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/27218555119.pdfIn PDF document text
    • http://terrietanaka.com/library/files/26951292842.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/gedesogaxipitumutefur.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c70d51d8c431cecfe9d11ae966a52e75/pilisuriladavuditukepena.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/89267087909.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/66663495929.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c1ceec88f---97328859851.pdfIn PDF document text
    • http://health-bridge.in/upload/file/9660912927.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/22e969ee1486d3c6f5ba20421182a047/97386304527.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/raxupakosibemutegidumadit.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/dd41944465ce6ff700bb6d9ba92f0513/46740492308.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ede59304e6---bizulaxixefagif.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/38309590899.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/pezotovofamurefob.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/92915251321.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9aba682d0b---fezikejobibamogal.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/57930640260.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_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 16564 bytes
SHA-256: 0221803de406bcc4b9523c62ca0fa867edaec09a3aa5077bf3b53d11373de3b3
font_02_sfnt_off00012840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12840 10856 bytes
SHA-256: df339de624b693266d9b698b0c4055fcce4e766aa67fe62cb994dca6586051e7

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