Malicious PDF — malware analysis report

Static analysis result for SHA-256 1996be7c20ca5cac…

MALICIOUS

PDF

77.8 KB Created: 2021-08-13 12:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1ad67a7f7e1590f9f81dab4c50699495 SHA-1: b2545eca06b477ba0011e3dc9fd7ed0e2e9b9920 SHA-256: 1996be7c20ca5cac265fed2b0e1ae7fe93b2b8911f0b9c2f509e67121f4b09b1
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610e78ea2e9d5---33229021388.pdf In PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bc567f5e068---tamulodosivi.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/b36ad63897e3e0baabc597c51d21e73b/kunesezugerapen.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/80519063422.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b69843f086---datifo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0df2d1a64b---milimi.pdfIn PDF document text
    • http://ccsl.asia/files/tedazapigupawavased.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/55324560342.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/dutogisavosaweka.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/tn1nd92j0viala3mo7o2quos8j/72995562197.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/ligisanogalodexi.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/roreruvotejukefo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4632c7bce8---61172328426.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/37927826947.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/mevadirosetizalamotiv.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2abcd64a47---giluwovefaxabirana.pdfIn PDF document text
    • http://blueyee.com/upload/file/010254506829.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/34e1cbb78009d24f7e966376bc47f006/93316102579.pdfIn PDF document text
    • http://pvvc.cz/files/favotepivalit.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/9230432308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=windows+xp+error+sound+effect+remixPDF 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_off0000c495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC495 10856 bytes
SHA-256: 9405bdbb0b8d835db5fdc773ee347724302d37a09cdf03f3f8a71b905f9d570f
font_01_sfnt_off0000ddba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 19028 bytes
SHA-256: e99aed5253442f5b68ed33f7cf1ce81ae898cd6f5aeff84002cb3f8c1c55ac62