Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59da7ea28c1a0ea…

MALICIOUS

PDF

92.1 KB Created: 2021-08-15 06:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ca6a27091d75318b3bf09e265ed8bef SHA-1: 9985e88acd4c6ce5c647d531e79878b933bf84b7 SHA-256: e59da7ea28c1a0eaabbfdec551ec759dd457cc3962538f50db35ce37115662e6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b625ceefa6c1079f28865239c173a754/sabatif.pdf In PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/dgbfqaaof053fol1ablkqffblv/rawetelomulisorofelaro.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/gagefawuxenizogodebawup.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54c53d9cb4---ragapojunudidodofize.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/waligekufikiz.pdfIn PDF document text
    • http://apvn.info/userfiles/file/82365452329.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/ponegorawuwuxeni.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0e35508c5e064ff08516dc9bb91ec063/padanodunefe.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/veturepinagunum.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd18c72e48---gupupuzefekakazumifuge.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/sisidoboz.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/kowigonigifagas.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727f94f2534---29389684136.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/jalatesologotoduposolewew.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/52e5c5761aa5148667f285e5dd1afc46/82644123455.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/5033a267f669b9e2fb38451bfed28692/39259141758.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/16288447307.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/30628266458.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a05fae1113731a48f5a3178205912f4/39309776214.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/sutepupikikosodaruj.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/62461492764.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bazofugotesunofarizi.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fcb5eeb0---55692533493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=comparative+animal+physiology+books+free+downloadPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/geretejemiwizajozukipu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 11472 bytes
SHA-256: 7345acaed064aac718170aa142919924ae7d6ad2f66d95518c6ccab3252fc4fb
font_01_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 16120 bytes
SHA-256: 19fb3e0837d6f9ee728c5331d7bb33e1bff3d595bd4ca4a0aae7833d7d421d60
font_03_sfnt_off00013149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13149 17864 bytes
SHA-256: c5bc38693ae1b888ef086bf443247f14f45ae20b18da83a90063898cd886a387