Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45f4b7eb46d04e9…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 12:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 843ea6f2edad2b6917c35c272c3edebd SHA-1: 2c6c8ae7e56df92a685aa574a4c5cae445fef2c1 SHA-256: c45f4b7eb46d04e9de132991bc0a9787bb4bdb40336c3d35df69b4e948291807
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://taksis.lv/taksis/userfiles/file/gesepewim.pdf In PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2a76c16757e977073d4c4c52e3699851/15530046604.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/2323227948.pdfIn PDF document text
    • http://webbuilders.com/files/file/wibemewafutafipudop.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109161635515565.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/fesozebag.pdfIn PDF document text
    • http://domexpo.ru/up/file/gibuxunu.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210909222824.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/zeredewapitol.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/24f689e50ec8d6608bf8bc2721f20e87/96595470065.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c4cbc157b326492b3d3cb75dfab9b51f/pugumevunurobomumimesip.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/dc58a1db72eeae5614cc7c558ca56081/pivekit.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5186af71---pelonijerefiki.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/xufilojifowuvajupidadez.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/betuxorami.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/tirupepiko.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/96810921456.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a9c3b4039---32801000063.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/sutonokidavarupum.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/32308614266.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/93458889029.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/a8vp6pouo63sklkddlf2g16fde/49730621315.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/mupukolimar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=watch+anime+on+android+tvPDF 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_off0000d3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 18268 bytes
SHA-256: 3ddcc66402511078267ee11b0efeb5b50640a7376649b2574eb49f1af508e517
font_02_sfnt_off00011b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9E 10480 bytes
SHA-256: 1e8877df558eee3e3ed6db00013df825fb0a0aaf91f61651dd12f89c3c722b5c

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