Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5eee83a22cfd712…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 23:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29bd8138c0ced232aaa5024ab01792d1 SHA-1: 4bf47c0ab50eef9c6895c6104fe67f8799a297c9 SHA-256: b5eee83a22cfd71298c908128e2b9822b14522a2953381f8c4fd6cffc9d722f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall PDF structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=download+tv+cast+apk PDF link annotation
    • http://celeb.huh.hu/UserFiles/File/sepinugetajopefowopotedu.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/bozunutedofi.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/74955807940.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/dolerotivotixizu.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/votolidar.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/42722804315.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/rapodaxudedaz.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/16403391474.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/sopafozorasamozivowitir.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/11202608420.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/98062839305.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/86246442231.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/16841621511.pdfIn PDF document text
    • https://aneri12.cz/res/file/tadipekokix.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff5731c8de---riwoposakuni.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/dajexejibuvogomegaxateb.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/nexeruxavixaguma.pdfIn PDF document text
    • http://reichspfarrer.sk/file/gapuw.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e982ebc417e0205c978f4a453786a58/68336076583.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/567a893d7fb5ed6583c2dde3244e374b/xawazilekuzaxawafunuwufi.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/tulalezajufefaborojisim.pdfIn PDF document text
    • http://superazs.ru/images/news/file/42386900245.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/051e3f529b64c213a4c159f024e06dd7/pozatepipefojafop.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/bupivalux.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/91070500964.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_off0000b39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39D 10428 bytes
SHA-256: d1d836d7aad3eb48c1f285f072e4144a81e80aeca9b491f0583b9ef1cfc2cdd5
font_01_sfnt_off0000cb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 15040 bytes
SHA-256: b332a7716031d477e0171f64fe01d4e90e7eea00211692e14550c0e88947e0cd

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