Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d405c0850e7749…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 23:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce772c9f8cd6fd661298409f3aebe08c SHA-1: 73d8ecf374e589d20298d2cff98477b6dca94063 SHA-256: 26d405c0850e7749bf3d6bfc27a0fcd03aecda5613452a44711b63ea37aef79b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=gervonta+davis+vs+leo+santa+cruz+live+stream PDF link annotation
    • http://klasykarozrywki.pl/public/images/fck/file/pisulozetiwerizux.pdfIn PDF document text
    • http://esteel.my/userfiles/file/72095176642.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/54031539510.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/96923090071.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/rimana.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5ae835a42---67480419770.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/fixubudejojedelimasikudu.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/24354186185.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/sasejurudixi.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49542581953.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3dda194420b415993e42561a3c4b7834/giziwegujutewaru.pdfIn PDF document text
    • http://netart.hu/userfiles/file/tusuxeloreletabusezipebu.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/26858403943.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///39779465424.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/gijixamiwibasajadavuken.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/figazamofisurigi.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/78295640252.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136508ab13ff---jivifexekepajimuritewamam.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613968122fb48---15906524.pdfIn PDF document text
    • https://windsbs.biz/files/file/40632801758.pdfIn PDF document text
    • http://mdtrend.hu/files/file/lakatobibixigisekas.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/5852890942.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/26697557433.pdfIn PDF document text
    • 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_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 18192 bytes
SHA-256: 64d02d5b912b6332e688758337a34e7a4ee47d2b6d247b641af5223b05b4461c
font_01_sfnt_off000111ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 10796 bytes
SHA-256: dca4d7e1f86131794711f4992911e6bf81e66ee8499466feb476a6d0175d549d
font_02_sfnt_off00012aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1