Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be5862c0136cdf9…

MALICIOUS

PDF

87.7 KB Created: 2021-07-20 20:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 42733c3341c43320b3c713b4261fdfe5 SHA-1: b526941eb0daad02caeaab96279e27e38e6f8817 SHA-256: 0be5862c0136cdf9dd6dc707d7a76a2568f4a6d8bbce05ebb6589d3d28f3cc0d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://akcjonariusz.com/UserFiles/file/wokudelilo.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f4527fbd9f5e15e0fea0988021cb442f/feruzonux.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/dbgpsdp2r6r0rae1n4ma5cvqfg/73070327560.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/7593235987.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/973425cc473506624fe3ad7f971398de/91625682995.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/mamubokilubewin.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b304d8d5b5d---16654121434.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/2c521ca5c855aa788f0e05419a7f2c17/90758637665.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/16972463411.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/0471414431cb26e3d98f13f016e71687/52481781529.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/d9872305534a0007a114b5e7dc69399b/wolowemijomidolazagag.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/d06cba46bd60d57052777f8d5875c3d4/venatugakumonowunebamoxij.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/nifota.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/wuserifiladune.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bb461f20e---65084175515.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/80104166400.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8700ddeed76f178f72c7e634096d454c/tafebenuva.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/3d817dfa823de774f492d0a884c7bfaf/16861842814.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/86340793568.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724248299fd---metukofiguzavejufozo.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/32710981944.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609474d941937---sotiluporamirugovuvoli.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0df0f33f---subepuduxiwulifurewisad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=problems+in+agriculture+sector+in+sri+lanka+pdfPDF 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_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 11296 bytes
SHA-256: ae2df75f66b6ca6cb7ea86ef26c3a908f194cb3302df3f75750098f1a9300ac3
font_01_sfnt_off00010d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001253b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 17284 bytes
SHA-256: bdba60ddc5305dc5690225de2962797d12e7afac1fceac053baae7130d0ed360

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