Malicious PDF — malware analysis report

Static analysis result for SHA-256 745e6ca4c83239b5…

MALICIOUS

PDF

94.0 KB Created: 2021-09-19 20:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4dcff7ef81ce9674bff6b349b07311e SHA-1: cee3322d92751971ca8f363751969be0fc9584d2 SHA-256: 745e6ca4c83239b500ed3ff5433f351222870ac983c1c2e3dd5f4a87052b600d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.detskaoptika.cz/ckfinder/userfiles/files/namevupetol.pdf In PDF document text
    • https://icoachyou.biz/images/ckeditor/files/risunetebojonewos.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/68273653926.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161322d60942a6---kumokupofusobovove.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/35204023345.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/wilomakewowibubesile.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/rigasujutimupebaxufiral.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/tolozoganamipajevabad.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/marimazimagapat.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/videkak.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/notuwalasimobosikaxolun.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/74680835602.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/30304112309.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/zolavinozalegupokogevupir.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdf2acbabf---21840962088.pdfIn PDF document text
    • http://retailcop.ca/files/japawigebobokuxuwodolokis.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/15350073712.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/podiwinivev.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210908223252.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/88456536936.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147350468e3c---tajatuluwowuka.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210914171242_sb0z4g.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/22681130272.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/xowuvumujumaxibipul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=free+robux+generator+for+roblox+no+human+verification+2020PDF 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_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB6 18300 bytes
SHA-256: 759603ab87e6eb78872c1169dbe386f18d7225b9842441c1c272ff2c82993836
font_02_sfnt_off00014f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4A 11244 bytes
SHA-256: a9635de26142b532e3f3fce64c8deeab45c03f5ce681f902b3ff055ba76d4f28