Malicious PDF — malware analysis report

Static analysis result for SHA-256 3669e3c9094e15e3…

MALICIOUS

PDF

92.5 KB Created: 2021-09-06 08:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 59a62be179c2e407154641acc2314078 SHA-1: cd6e2077756c981a085a35b34d429e0a80a720b7 SHA-256: 3669e3c9094e15e315e241f09367af89e2a0e1eb49c26e019bd969136a3454ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised CMS upload storage. The embedded URLs suggest an attempt to redirect users to potentially malicious content hosted on various domains, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://immopolignano.lu/images/12952365352.pdf In PDF document text
    • http://train-in-japan.com/images/blog//file/79202131673.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11626864d5---damubodawotujiviwu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863b3ac0784---76841923459.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/46175281370.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210808_16A36B2BC89F5DBB.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6cd3bfacb---pomitemobo.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ecbb08129479c33cfc3ec1bfaf3dbfdf/62406989143.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/vasaxisugukupoxexewizez.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/subivilaromiwenizezawiso.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/17251928195.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/hj7rkldguc72cdick716vhb72fkqt0sr/lejozebutarukutorozosu.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/d5441fb3ff7e9771d3e47b8a12f714c2/munefazugese.pdfIn PDF document text
    • http://holzbau-napetschnig.at/ziporopabobixerabebado.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac6d659303---pewenoxawajitub.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ql75rra48fv1ko9sbrb361rd35/19390608516.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb3bde12ce---2842571991.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d9e39ffad---82185899851.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/813671484.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0266b0f779a5ca7d78a5819c292ee287/46881006050.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160db16c67d3ac---72821557258.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/naxus.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/43992217457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pandoc+markdown+to+pdf+cssPDF 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_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11854 10692 bytes
SHA-256: 27ae6ce6df2e8c61dfd6aeb62877642e58bc4b5a9b1e526b6bc7232b61999591
font_02_sfnt_off000130e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E3 19332 bytes
SHA-256: 8ffc0b1468f2e9536c908913e6771e37126f1480f74c3c6b8c192d99bc5d5753

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