Malicious PDF — malware analysis report

Static analysis result for SHA-256 16aeb226646bf115…

MALICIOUS

PDF

71.2 KB Created: 2021-09-29 05:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02efb6d17bd1446a9f4b73a394f1f57a SHA-1: f1afb375bf0b55e7866284ccf2e72ba8017bc912 SHA-256: 16aeb226646bf115362fa7b80bf17929e23e2ab2817382c1cedb5c01cca57cfd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/4838550014.pdf
    • https://aathichudi.org/userfiles/file/62893530857.pdf
    • http://kimkhimientrung.com/uploads/image/files/34019523697.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rra37ecfsfaakg6gd174uh9qrf/16712140182.pdf
    • https://kingyao.com/uploadfiles/files/20210922_185431_9648.pdf
    • http://ch-bovi.com/upload/files/4058421753.pdf
    • http://revtechnik.cz/userfiles/file/gijusakumexabifu.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8d183d319---vamukegerupilobuxidod.pdf
    • http://www.yevres.fr/ckfinder/userfiles/files/zopigofatelewotoj.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/sdvkfsofav0knb4bhc0cmmd73q/giremaf.pdf
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/12708882148.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/23511782625.pdf
    • http://ducthoaudio.com/upload/files/87162009217.pdf
    • https://mimpisiluman.com/contents/files/99949193714.pdf
    • http://serbanindustrialconstruct.ro/uploads/files/72794782789.pdf
    • http://frutapac.es/ckfinder/userfiles/files/sadadejowiburupekok.pdf
    • https://h1t-urlaurora1-turbo.com/contents/files/pawibaguleveko.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1de8a1a19---kowogosafobudi.pdf
    • http://zhuoer.ltd/userfiles/file/firumanuwefopupases.pdf
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/fonifumuni.pdf
    • https://intekcanada.com/ckfinder/userfiles/files/57999924387.pdf
    • https://ikuseikyokai.jp/ckmedia/files/20898133396.pdf
    • http://35ct1.com/images/ckImageFiles/files/xaxevijusomosevetata.pdf
    • http://gzcil.com/uploadfile/files/10204227303.pdf
    • https://edarky.net/data/file/petapabukeragaralibizafi.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/43420012205.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cool+home+screen+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3e3.bin
ea5f3265092e9371d5f2a4c9650f171d9a78f87e8397012fb6d451cc4d33926d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E3 17284 bytes
font_01_sfnt_off0000dec4.bin
e89e5ebb3523cedf113e59179feb7f45fbca28c15dd7fa9acdea4254fa0ea7a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC4 10676 bytes
font_02_sfnt_off0000f707.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 16792 bytes