Malicious PDF — malware analysis report

Static analysis result for SHA-256 66470934f4138ee6…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 23:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8aef32fcc5c15f1b1102a38b94baed6d SHA-1: 4a71eec5533a251ce63ddc245cbaecd51cb9000b SHA-256: 66470934f4138ee6806d5a302625508478337cc95b32ea65c7e7146e0a05a362
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071f1a4e22c1---10444656302.pdf In PDF document text
    • http://timnhanhonline.com/upload/files/70287682468.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/kabavavojijoniwi.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/kilop.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbdd2e5b0---82704415559.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e247605773---ritasexenigewasitosoxuko.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/96055723406.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c8965696116e5eb12048839f3e3b66c8/12054497140.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081ff19b0758---jetuwasopig.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8aa5295da8---98092986191.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/7bff92501c378a857dedc422ba5728e0/luvegalo.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/35691876259.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/76741137232.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/37378361449.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/73dff7107b78700d92a2762050a00cb4/65973481639.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3ea72a182d72bc827a6d2b209a36ec03/kegawitonafamasuza.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e87a3706ee9bda889a46c35dbb0a0f69/23846731492.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/85200629024.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/sewovuramadirigami.pdfIn PDF document text
    • http://ridendo.cz/files/file/18074304339.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/302942005ce1d5ab91beee2c34bc3dde/20600710516.pdfIn PDF document text
    • http://jinohair.com/upload/files/revozafe.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/sevofuj.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/kadago.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/lotusujibagifopefadoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hand+drawn+thumbs+upPDF 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_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 10584 bytes
SHA-256: 343221461e3190d112f204c708d585fac4dd08adfa65062ab3cec832e6562715
font_02_sfnt_off00012761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12761 16000 bytes
SHA-256: 7926001945393d02174561928773fb84f069aab1a5613f183b2ffa559fe925bc