Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eff07290b1b038e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-27 18:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e8e7ea4a9779af343b4db090ded1994 SHA-1: efaf36961096c493a6bdc09e770679c4de0f3bf2 SHA-256: 5eff07290b1b038ebd209925240805a71ffa8e5215c826a9c563d855fdd7b4ff
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The 'SE_CALLBACK_LURE' heuristic further suggests a callback phishing or tech-support scam pretext. No scripts were extracted, but the presence of numerous suspicious URLs points to a pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/uplcv?utm_term=where+are+deleted+photos+on+android PDF link annotation
    • https://inwestorfinanse.pl/userfiles/file/63360380285.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/64376259282.pdfIn PDF document text
    • http://maaramachandifpo.com/admin/userfiles/file/pasaguta.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/29933563304.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/28520060678.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa8b6b3bff---58358549589.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144593c45a4f---9773112845.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/53322827692.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/magukinebavikovino.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/wekak.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/68512703057.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/lewewubisojef.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1232c9bc2---83112066762.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210918_5F8B24D11D5EEA2C.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/akq7g1uvl1maqdqhu7ka0ki7ik/favofenisovurapopor.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/93014595283.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/59895551947.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/84862161390.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/20274402975.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/77830963190.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/ledafifafejedis.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161393a78e127d---7664128069.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47120670396.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/fopuwus.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE69 10480 bytes
SHA-256: 10c1554b2a9a08ac3de318f08dc08ca9e373a94f780cf803c943449d2f168ee5
font_01_sfnt_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off00010412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 17736 bytes
SHA-256: 00b156561ea1a91f639ed76e7330ab3f6ee2d5de5a9c194cceba08f67092ef1d

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