Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad43de0d789775d8…

MALICIOUS

PDF

69.7 KB Created: 2021-09-19 01:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46c49b425515b297cd455a348cedfe6a SHA-1: 0667676a2325ed2dd10daa4ec759bf8a1b38bf5d SHA-256: ad43de0d789775d81ab15c373595077d16abdc02fa6bf5260f6086da22f05566
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or suspicious websites, some hosted on what appear to be compromised CMS uploads. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a tactic to obscure malicious destinations or leverage SEO poisoning for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/uh81ik8j8l7ifekc0upt3ta6r8/kesipugu.pdf In PDF document text
    • https://rhuyscampingcar.fr/images/files/wexopenaniratosudevi.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/63034692158.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/rabowokalabo.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/bedefasokuturigiwetaxebew.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/76863035159.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/15841706156.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/nugosavesezilurili.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/lofidikoj.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/lekaduvusukasibojimegus.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145298b5bfc1---bekizuxunipawip.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/95016243af27a83152f3960400c844e7/rerefudegowumefiro.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210916080610.pdfIn PDF document text
    • http://kag.fr/userfiles/file/lovomejoveluwetozotifif.pdfIn PDF document text
    • http://slsnn.ru/content/file/fusimuk.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/84143988195.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/15094867072.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/pelaxusagadosugugiwuwuxuj.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/perixazom.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/91145467057.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/relatezasejexateda.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/871e2ea0a937d6caf46c603f3a7caedc/23486346939.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/29470274969.pdfIn PDF document text
    • http://iphysiology.ru/upload/favolap.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/67175487271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fortnite+wonder+skin+generatorPDF 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_off0000b265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA77 15424 bytes
SHA-256: e20deea5fb476a19cb434194ecce2942963145cba5b94f951cbfca66f977491d
font_02_sfnt_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 10532 bytes
SHA-256: c29cb5cfcd636c9625f982709f92520d2a672c05751bef9f88fe8279d6ecde10

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