Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c8922afc7d201e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-13 19:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 94ffde5275521555466008917f02221c SHA-1: 8e000b638bc7a089540c6fcd262812c971f2808a SHA-256: a2c8922afc7d201e1593851a595e30b4932911ced214864034db9f21adde986b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document's structure as a link farm suggests it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=goat+sim+waste+of+space+apk PDF link annotation
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/gnqab0t27vosfgt7n4m4lvr214/natuzediguvotetotarifiraf.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/73671686625.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/70857743748.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/pepasozonexiv.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/vibiwenedek.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130da348fed3---3690516075.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/63026295508.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/78736069498.pdfIn PDF document text
    • http://gestioniarmatoriali.it/xamokop.pdfIn PDF document text
    • https://htchninc.com/d/files/namejo.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/67648248967.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zafavifererorenifinisote.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/34999658186.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/61695122580.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/tifijewum.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/64313593616.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/noxasidejebojovisuvo.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/87376119258.pdfIn PDF document text
    • http://brenderup.ro/mm/file/42967987342.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/36435136801.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/msk0rui0h9som5okl3ah743617/25672960728.pdfIn PDF document text
    • https://stotex.rs/files/zadedifupo.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/38311bcadcb0660a411f1eedd2ef7191/nulepajason.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/68683496098.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_off0000c088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC088 10608 bytes
SHA-256: 9dab400ac706e0321719244e0cc4eceda6841c1fa10d75c31f6493da8cd507dc
font_01_sfnt_off0000d8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 18012 bytes
SHA-256: 33217fb57a647f71d229a17a6c8f5919fb217b3bb7ced2a63be7ebeb3f8dcc63
font_02_sfnt_off0001080a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1