Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a1c99d390a1be0…

MALICIOUS

PDF

92.2 KB Created: 2021-06-28 22:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c6362e5d4064ad24866c0cbd94f0477b SHA-1: d81a0b5951cfac7557fc9d61f652579dea48c3dc SHA-256: 83a1c99d390a1be046026b6c7345334385e70d5376003d070c6035385828d7bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and link farms pointing to potentially compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://garglob.ru/uplcv?utm_term=jeff+the+killer+and+jane PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ju5ko98e65gn73qldoobtcenk5/kirexupijugeregab.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924999e3c31---palig.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/216a21cck11j1t4sui5bg68fk2/28686850357.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/974de21889c1cfb3fc697bab0259fff7/57607921456.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec64bd23e---kabagogulekakuvet.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a9838f46---30710759471.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/33579150844.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/jumok.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8a8d72e72bfe3d06823cb5e70e8d28f1/51062649575.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/sugegomulajebokisu.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/812f56bad10b67d9fc4db0707381150a/kibesawowegigobunenas.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/a2ps136mm8j0bteet4ek79o8pn/dimidinutivoduvan.pdfIn PDF document text
    • http://industrialdevices.in/uploads/pasalodopixefu.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/nagejejomusamu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c776d659916ba0e69e95610fea6df751/5807077818.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/53065073740.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1466db16---44519222409.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aec443dae01---92517490547.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/livegowovam.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/114780256960983f025b79b.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a5452fd9a---guviziwosi.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/cb8faa8ce8c79c81f30faf3df652fa1d/43500513014.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/5cp52fnc01l6fna7lsh0vmo2gl/xifenoxizisagawosobanesi.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/12622841961.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ki221qt89rjqbjj6aq414b5ni5/49503985058.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_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 17020 bytes
SHA-256: b97680d130c9163859a96c69c9ca73ee8030d48013b8cef6bd9e2c2a538c43e3
font_02_sfnt_off00011da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA0 18832 bytes
SHA-256: 86d12b5ca7c15f106bdc13cb9221be952abf1928912ff2aac5d27240ccb8095d
font_03_sfnt_off00014be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE4 10376 bytes
SHA-256: 27ea1dfba7408602c8fd9a7bf208e6f455c85a186b1cc94a288b5c1923de18ca

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