Malicious PDF — malware analysis report

Static analysis result for SHA-256 3588beb0b9b8e7de…

MALICIOUS

PDF

80.7 KB Created: 2021-09-24 10:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8f6a84514238de09e3c3ee0450828836 SHA-1: 1f0d38c578db19ba7f4b68d7d971c5920f6a44ed SHA-256: 3588beb0b9b8e7deee7b8773219013433c195941c6a6f879130662f8358e79c9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://rebeccaosborne.com/uploads/wukegisil.pdf In PDF document text
    • http://gardensyellowcab.com/admin/images/file/66405306384.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134d0e357264---81770390009.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/genofu.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/14823485751.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/kijikedojexurotubige.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/42943153827.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/rudarozowaxas.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/90818960412.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/37e2986e5ae3cefcf8e5666e53d4b039/62386145913.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/tojosufijafugufebebo.pdfIn PDF document text
    • http://1careglobal.com/upload/files/likixaramefowijedabufu.pdfIn PDF document text
    • http://jar-ted.pl/file/8399598515.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/tedomuwurafamusu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613df6f4969da---94366911074.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e07c13486---pomasekaz.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/24553897876.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/zamujumufogumurojamut.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/73305332238.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/42348756877.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jejadegezupukegowijewi.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/v8be1kvt4h528r0opaoemi9tbt/4331118041.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132999a0caf7---80956671841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=milton%27s+secret+watch+onlinePDF 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_off0000d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 17844 bytes
SHA-256: 24bb50a4f4fb356ae8f71f1771dba3f10141b6c639163ddd4d3c8d85b89bda25
font_01_sfnt_off0001058a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058A 10440 bytes
SHA-256: 4ef6bbc8ce9b59888a52e9428da6f0a1b4e27b7c0ffbcdf0dfb89480a1fd039e
font_02_sfnt_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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