Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11328660cc495e0…

MALICIOUS

PDF

189.3 KB Created: 2021-07-28 06:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3dfbc2707c375b81f09e805be23c594c SHA-1: de0486f684a093076a161fbb9ed7772445ddc861 SHA-256: f11328660cc495e04caf7479d2c7bc8f99259cdf6578854925566e5ba226ccdd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8557

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 https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/o6e9on69an0ck44qhpu0jsikh7/sibiroparinarobitib.pdf In PDF document text
    • http://retco.ge/ckfinder/userfiles/files/tebosetovokevexoxevu.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/80662632987.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085d93e2fc42---kirudigidoforipozo.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/lovakosisavaxob.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/bofetikevipakutixogemiral.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/mejewosoforiferovor.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/20063564099.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/6vboqdcr6tlfep0gkkkavtd6oa/93890004595.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/79487554346.pdfIn PDF document text
    • https://istanajp2.com/contents//files/50882125151.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/pexotobulojidafi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9b68e65b---zowuvopene.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/kujutizopo.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec412e39a71---larekapuxuwixaroz.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/52568035692.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/bumetuzifozalagovuzenabe.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/98493358264.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/74145968638.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdd4d0cb8c---xiparozokupuwobe.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/50679437208.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/zogumanutixolixegoxod.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/pegopome.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/7dd142351da957f2c630f67e5e930b24/ximobibilenofuj.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/10496505667.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/mejisusoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gakusen+toshi+asterisk+light+novel+volume+10+pdf+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B032 69120 bytes
SHA-256: 2def950ab7296ced474c6b3d755841a120249507351e842989205f2c6aa59d7d
font_01_sfnt_off000267f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x267F3 16396 bytes
SHA-256: 6a767c6106aca4d2d6c93ae2525336c910820acea8764d18d0eaf434a8092e16
font_02_sfnt_off00027e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27E90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000296a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x296A7 11504 bytes
SHA-256: 3b4efb976bf0c89851bc8fab97b7630182f76d2a07cedf29ed47626b847bc20f
font_04_sfnt_off0002b19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B19E 19556 bytes
SHA-256: 40d96b5a29656ad1fb0b0197f44a22d77421d8e38704089db3187f869f252e64

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