Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f489693d820f29…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 11:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 759998f114f9fe8f63f93c43a8c94cb0 SHA-1: 0070d96666f49671840249c972751dc065bd4c6f SHA-256: a3f489693d820f293e9a2fb74b6bc4436d1b4bcb619bf3418bad3ef0d364895e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farm heuristics points towards an attempt to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://peusch.lu/userfiles/files/fefatataro.pdf In PDF document text
    • http://hotelamadeustorino.com/userfiles/files/loxumavulixozapem.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/seretatototagikefexefovi.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea46912c4f---99858207879.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/nozopoguv.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/safipazogumikapudanoxoped.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/xefadumalulazebazi.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/kiritepovakorabarifew.pdfIn PDF document text
    • http://artospace.com/pics/file/39304207159.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/dumafifaminez.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/16a4a044f9295091ceb752ce9093e80a/88016357423.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/19560400601.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/94789073980.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb2878f4b1---31126268986.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/41248806044.pdfIn PDF document text
    • https://aitalk.vn/upload/files/72912486105.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/govorot.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161301c7cb2de5---32368810245.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/64177758200.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/13436048602.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/xesasevepe.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/pibelolabogatuxado.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/54106416321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pocket+heroes+mod+minecraftPDF 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_off0000d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 10788 bytes
SHA-256: ba68fee2a93b27dfa32c7f9cd62ceb17cce8a1d16e11a6cfd99abd029e1267d6
font_01_sfnt_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 17856 bytes
SHA-256: d8e05077c99236f5f08a67632ec34ab471059a66d1363b6a41444e31bffdaee9
font_02_sfnt_off0001193c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1