Malicious PDF — malware analysis report

Static analysis result for SHA-256 a294716f6d9c909c…

MALICIOUS

PDF

79.2 KB Created: 2021-07-24 07:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be1990a0a673770c435c7e31240ba9f9 SHA-1: 2467374728493e1105a58a8d160d0ef8942b5154 SHA-256: a294716f6d9c909ce278db257fa8af9cc3af9baddb1205e67b7004dec14fdfab
164 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external PDFs hosted on compromised websites, indicating a link farm designed to redirect users to potentially malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://frangarcia.eu/upload/file/basagapimid.pdf In PDF document text
    • https://swift-tw.com/lcc/upload/files/wilipasajefuxolije.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/nenazaw.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160779d36b1a4a---36002116269.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/b9omodkch37isirbbjlkg0en77/17893207226.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/96334072212.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc3514038---rifipufibeme.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/hoqu2tskf337ih418v9l9m8ot1/mefimokise.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/57d04d90c1e240bf8a941dc2e94933a1/muvowapimexo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0770423d---wevavudotunegomajexef.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/81338257554.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/r1s93vkkgionb7mv8fgi3d11el/27112757091.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/26d943748c0ed3499eb78b10099ea739/42574269151.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/bfc604f75edcde04589e3e12e9648cd3/dalevenedafamerutikerol.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab52db7b0fb---bowilubupumudexitek.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081670f2d8bb---92467053731.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b4714c65---zolixesigela.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/ef7b515f49f721d0118fd8541b6ef64d/rokidenatonafowowasur.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/82620853790.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/xevuxe.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/44883644602.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/94036429274.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/h1o657c9qmfqkurfucvbblp8f3/vuzoragexulasiboxepeful.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/ditara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=past+tense+regular+and+irregular+verbs+exercisePDF link annotation
    • 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_off0000cfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEA 10836 bytes
SHA-256: 6e35d0db20f11c73c5d773d6cfe46012577e24b3510e054f5f04d52c7a9b925f
font_01_sfnt_off0000e8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 17612 bytes
SHA-256: 6860a09d84fae4e0e74468f53710ceef88f9278876475aefb7e35d0b98ca3bcd
font_02_sfnt_off00011756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1