Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fa862503a9e195…

MALICIOUS

PDF

82.8 KB Created: 2021-08-24 05:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 01c89ce53f044286c04585e111180d56 SHA-1: f64b8759b03e2a2f4a8067e42ff4056e188b2e15 SHA-256: 72fa862503a9e1950e12ae2f75012e57f99b3a12d07896215b0bc85880e595f1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous embedded links, many of which point to compromised WordPress installations or other potentially untrustworthy domains, suggesting a phishing or malware distribution attempt. The presence of multiple links to external resources indicates an effort to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=how+can+you+help+us+interview+question PDF link annotation
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/1udfdufh6lkn12qjg73jgbit75/20640977382.pdfIn PDF document text
    • https://starbox.fr/img/files/sirexunaxidaxo.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/nalixogifudaxu.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/72540049883.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa2f35c6ab---85140189649.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/libak.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/79131823877.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c88d189c08f---vaborenax.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0739c7759---72991437811.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/rijatovejesijuno.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/dimixusegozimikegesu.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/jarex.pdfIn PDF document text
    • http://artepcb.com/upload/files/xogurepupopif.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42fce520eb3a757c7b2ee1cdddd8ccd3/92567162795.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/v35un308ltl0r24acplpnlsd1k/69804630216.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/wunapubafiwominujir.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/48958078615.pdfIn PDF document text
    • https://samowar.ch/upload/file/setopefof.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160baca12dfb76---xebeda.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/1i94ej11imec6qaphu7nj2ho4k/jodom.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/mopud.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/19018787986.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/mekiwuw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fffdf859d0---50498119966.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BD 16312 bytes
SHA-256: 9431758b89f10f3903cd53540ad8ba97bf6642ff1dd2c0cf7c4636963a396921
font_01_sfnt_off00010c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C72 10976 bytes
SHA-256: 3570afb252158064f070ed66c79ebf62ff3957adf5f3dc9f24c8922ec92ef462
font_02_sfnt_off000125e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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