Malicious PDF — malware analysis report

Static analysis result for SHA-256 82db36c9db451be9…

MALICIOUS

PDF

77.3 KB Created: 2021-09-20 07:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3bc6acee32e57b1a939886d8a1b96d6 SHA-1: a9f18c58c1aa1137996583a7cedebb8d34abbf45 SHA-256: 82db36c9db451be963cc42f2ef84a3900da98bbaebc48cd354c75b86dc155a0d
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external resources, many hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://n95america.com/wp-content/plugins/super-forms/uploads/php/files/fc02466edb08482cf8575f18d42fe887/wepoxaradoruzikaragirilaz.pdf
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/fesonepipizasapujexuzuwi.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e39a05b98b---nevokagaxirojusatet.pdf
    • http://prinsart.ro/uploads/files/93345245751.pdf
    • https://jv-cms.crazy-jessie.nl/uploads/files/41100839208.pdf
    • http://feuerwehr-mittenwalde.de/mediathek/files/39129345727.pdf
    • http://labradory.pl/file/26882540619.pdf
    • http://enidental.com/userfiles/file/20210910094746.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/xenigagasidiwijogeguzid.pdf
    • http://fazendasaojudastadeu.net/fotosempresa/files/59692687196.pdf
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/nuribulexegepumoteki.pdf
    • http://orsini-blasioli.it/userfiles/files/lesuvo.pdf
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/dozavu.pdf
    • http://world-housing.jp/ckfinder/userfiles/files/sivemelujo.pdf
    • http://kommunikator.nu/demo/userfiles/file///bujomaxirodaribiwetufo.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8434d21c---fibakixaxebesanalag.pdf
    • https://condicionamentofisico.com/arquivos/file/zizovibajum.pdf
    • https://szallas-karpatalja.net/upload/nevojejeko.pdf
    • http://cosyromania.com/media/file/68808209466.pdf
    • http://wannawwannie.pl/userfiles/file/nixafalazusukuxidavap.pdf
    • http://svx.su/ffile/file/pamerolakinitifitagor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=viewpoint+student%27s+book+1+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c585.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC585 16792 bytes
font_01_sfnt_off0000dd97.bin
19cf6d0a79609e167204993e8d89f8571fd395a33c582bba95ca604bdbbfdb6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 17744 bytes
font_02_sfnt_off00010be7.bin
e03ecfa96f8c9f7c37ab7ab1ad2d8986bf40af85bf5c6c622d671e9b3172c3f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE7 10964 bytes

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