Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3f911b89476086…

MALICIOUS

PDF

76.7 KB Created: 2021-09-19 15:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 44e7b4abe263d3f6dd483f21a5960116 SHA-1: 636942c7b899b423d6dde553e8e5379f98586dbd SHA-256: 2b3f911b894760865a0379c03cb2e083811ca74a23a5841f76ad0565c7c0cd4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=how+to+download+gta+v+in+mobile+free PDF link annotation
    • http://newo.ru/files/files/riwelif.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/lufujufo.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/fekomojomirakilaguta.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/ranibegez.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/97998619675.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f533e9087f---napaju.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/313accedb8daae4476c912a3a0c1f136/verolefofarapewir.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/75855397204.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/8961157786.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/46036664990.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/11274849153.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210907204559_xjkydc.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/88990320846.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/96130555072.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/080550545884.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210919_191046.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/13757816125.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/98808251905.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143d8cf3f189---mivonivofulivobirokujaj.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/37478338535.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/18994010523.pdfIn PDF document text
    • https://dhesient.com/media/20658960282.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/28856074746.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/nozopetemopolator.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/tuririwotegunijuzuf.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_off0000c769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC769 10812 bytes
SHA-256: a528d7dd6ba10e146c428f212884c49ab187d588f9f65348f4f17d68048a2309
font_01_sfnt_off0000e021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 17312 bytes
SHA-256: c3838ad3075f824bbeb835185062db732e631aa87c271a3d6672738d968dc06f

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