Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c87b06d51e622e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 21:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ee0502b33f15ff0b62e882de9e7fd61 SHA-1: 300d850946aa2abd73fc7e0e96f9e24c7982bad7 SHA-256: c1c87b06d51e622e510b601c80efb73ec8b29eb8f97b9bf0c580d8c0b5b7738a
204 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing and trojan threat. It contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The presence of a 'download button' lure and instructions for a password-protected archive further support a malicious intent to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pistant.ru/uplcv?utm_term=windows+loader+for+windows+7+ultimate+64+bit
    • http://studiotecnicolamanna.com/userfiles/files/popibufozepejukazutetovo.pdf
    • http://microcement.ua/userfiles/file/39055740191.pdf
    • http://nutrizionisti.eu/public/thread/risorse/file/zulakuzupiribado.pdf
    • https://asoriofrio.org/ckfinder/userfiles/files/jodiredikefote.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/roruzilimukunekomape.pdf
    • http://hp-cnc.de/uploads/files/44439795453.pdf
    • http://ilturismoinitalia.it/userfiles/files/bowegajepon.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/9dfdba2fbe5a7331d1463c74b078f25d/98640363128.pdf
    • https://npkfertilizerproduction.com/d/files/fokipupunaxojosub.pdf
    • http://solarissoft.com/img/userfiles/files/nidevofidufomesowexajeju.pdf
    • https://hoangphatdanang.com/uploads/image/files/32706625066.pdf
    • https://unosms.us/userfiles/file/bukigalikamuruna.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/904fd3614bce5fb89a20a2d8683325b5/35699385537.pdf
    • https://thefertilizergranulator.com/d/files/37878299841.pdf
    • https://nazragame.com/calisma2/files/uploads/pupiwejuwanejuved.pdf
    • http://fuhua.tumujike.com/assets/upload/files/202109071059291796.pdf
    • http://law885995.com/upload/fckimages/file/86671325256.pdf
    • https://vrindaindia.com/php/joseph/uploads/file/wejaroxojetetafelizifoz.pdf
    • http://wideanglepackaging.com/ckfinder/userfiles/files/53248613490.pdf
    • http://marinda.ru/pics/images/file/jalatijibimejuweneko.pdf
    • http://abwingssuffolk2.com/uploads/files/pufelinipowo.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146a8f1d0c3c---gizogata.pdf
    • http://vln.nl/files/file/kopumonoluzofagidakib.pdf
    • http://jjw-led.com/userfiles/file/6213951568.pdf
    • 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_off0000cf17.bin
671c00bd2a07f617a68fa9ef0a1abb1e4afbc50f2824003493ef5644826d2b5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF17 11128 bytes
font_01_sfnt_off0000e933.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 16792 bytes
font_02_sfnt_off00010145.bin
1dd67c20ed16cbcaff96a162328182e9faafb4fac7864416b31a057e002adaa8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 18604 bytes