Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c22303b4b7d331…

MALICIOUS

PDF

93.8 KB Created: 2021-07-01 00:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 6271c69d9fc7347b608a032bfbe7182c SHA-1: fc13ee8baf4c5dfa6fe53290934e80f8a75933e9 SHA-256: a5c22303b4b7d331afef29d8e93c005557635a6a8858afaa900db3e4b4fc9131
164 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating it is a link farm and potentially a phishing lure, with a specific heuristic flagging a 'download button'. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs point to compromised WordPress sites and other domains, likely serving as download locations for further payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=geometry+volume+2+answers PDF link annotation
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716dbc1c6b5---kelid.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/lametorujegis.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/39e244126510e25ea646569661e2fd62/29238960605.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/nafeganoderufozego.pdfIn PDF document text
    • http://cocoal.com/uploads/file/befise.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/eb5461ef4fb364ea74115b148761432c/41416177511.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/76971219918.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2ab3799812000ab63c207e43eacf72d9/dizudirozimiresez.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc7517d6f3---godudawanezudogumis.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609021e0e9466---wusenujekopad.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608634de0cc65---95297459307.pdfIn PDF document text
    • https://papiratisk.cz/soubory/budolewadawerap.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/654e80418982a41975de59761b438760/piludelovage.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b554cfce3eb---53229458008.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/mefukivebexikapeserodide.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/nabibagezirazu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e619c53a9b---konuvorogoja.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/k9qj6oj25fgbn6d6cgd3lcllsv/tozifepuxaxuxamumagebozas.pdfIn PDF document text
    • http://usateatop.com/_upload/files/28196599808.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/vorarufi.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/rimazedavu.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5acacbbccb---47528326766.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/womivul.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/27970991488.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_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 16168 bytes
SHA-256: 5f39e466122962ec657a3286d3c4d373f6eb695faa0da47804534274ab1ae091
font_01_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E80 18864 bytes
SHA-256: 9972936130563cbb7f90c7a494c20869d23bcd35156ea66885ef81ff7726d41b
font_03_sfnt_off00015091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15091 10700 bytes
SHA-256: 72823fe6cef3b27c28857a8f85afd239baba93ebd452e72c575312055354aab4

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