Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c271c6e5efc498c…

MALICIOUS

PDF

85.5 KB Created: 2021-07-02 10:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5b79fcc2836f1461af1eddfa323cb5b1 SHA-1: f10b7448f3e9c1b60365c1383bc2e7bb1e8a40de SHA-256: 9c271c6e5efc498cfb1bf2d7436648583ed36cfd9e010a11581cf74ef2233a5d
164 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other disposable hosting sites, likely serving as a distribution point for further malicious content. The presence of external URIs and the overall structure suggest an attempt to lure users to malicious sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://synerhu.ru/uplcv?utm_term=bluetooth+pair+apk+for+android+tv PDF link annotation
    • http://linkingpeople.info/userfiles/file/9381311526.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607114f3a3178---zoboraxob.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/48c7f1236a5ca76f57739df915896a29/16854495529.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855db7cd2d1---sawiganovukafemejaja.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/n3v6d0fjj0j2o0952f2s2cllb3/rufimijexitebapovodude.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/nibugexamotumekogimasise.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/007b19a899a6a73ba4da42aec38276d5/72913850493.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a3b43c26a---24086420831.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/23549638945.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160708ddf68df5---21832100118.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/wabunede.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/35637866229.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ae1a84a11---litut.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/06b7216f9576d68dd36128c98822a517/filipi.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/nadezifumopanekugufigom.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d42a3e9dd---11052546411.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fdd9dad72---52990006194.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a4e0b0717402ed9febd8c1976b715b6e/vimivofobilenat.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48d394ab1---bitozaxijotoseputijid.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/39cc64324322c9f2f5b03fe7eaf6f0e5/mawedaposufijeke.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/22197394428.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/nugitubuzevopakunabibuf.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/365a71abd4ab1e74fa63e84521ff15a3/71482032384.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/wurejabe.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/93625307544.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_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 10740 bytes
SHA-256: fe2a7b0ee412f768dded58b991e24cbf98de73214a78f3d7f9a863b16f9d8e96
font_01_sfnt_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 17052 bytes
SHA-256: 87b2291afb6879b316b927e4be1343e512ebd06c2c09c83e3bc2959777ab67f9

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