Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5bb26e6bb523f6…

MALICIOUS

PDF

69.8 KB Created: 2021-09-17 01:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: df65978061473ae3e606b2799c7b36f0 SHA-1: 459eaa05186be98279dd644056e5f0ff2dc9a176 SHA-256: 5d5bb26e6bb523f6ee0c662f3ac532748358fe1d28c0a2b64e734827f5b39999
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of a link farm suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kumoxamonufasukedukabedul.pdf In PDF document text
    • http://poptheme.cn/uploadfile/files/20210913_223419.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/falazenirarevozuvijewobu.pdfIn PDF document text
    • https://flyags.com/editorResources/file///waxapupepidusegamasegobes.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/51718353904.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/rerasaxivoz.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/16703278328.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/61994342892.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/45020574263.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/mak878sgnf9kg6rm6jfipbl6a4/gosutepo.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/zeperefene.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/19046481174.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/josaxelikefexopas.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/26156081633.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc47dae447---tidukixogepovuro.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/tifipujesevesawaboruzun.pdfIn PDF document text
    • http://www.heksan.com.pl/file/tigojuzamovu.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/lizizigegizogurisanumisu.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/63420046133.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161417d127c45a---29112321752.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/mufotifagafavunojo.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/xobigijofawodojesezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=webpage+not+available+android+studioPDF 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_off0000b01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01E 10868 bytes
SHA-256: a3576ec78a904e353046475425dd84f137c2027ffc488e512c155766a7893a69
font_01_sfnt_off0000c8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F1 15108 bytes
SHA-256: 7a0f08700c4604e0ada5baad13f53992630095355073997495547bcd604fff90
font_02_sfnt_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1