Malicious PDF — malware analysis report

Static analysis result for SHA-256 1189bd2610dbbba2…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 03:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c367fa0970c89485722842647442361 SHA-1: 16fa8c68138660c6406a2f56476c1cc7e11cbcd9 SHA-256: 1189bd2610dbbba24c3a77d332dfe7b5e1cfe69c0ff2b9debfa872a337c3e1f6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and a critical ClamAV detection for a phishing trojan. It functions as a link farm, presenting numerous URLs that point to potentially compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://paitoonbox.com/userfiles/files/gotezulivolikaxugogomev.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143035be0053---remetev.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210908_89EB6AC8588D4DD2.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/fuzepuzipaduj.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/jubowowebepikerusud.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/95682973235.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7cfd89b32---4421844184.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/40930145022.pdfIn PDF document text
    • https://windscrm.net/files/file/43460816348.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202191101041.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/puwalogesukudugedo.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/33315059716.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/13589739407.pdfIn PDF document text
    • https://theurbanthinktank.com/files/56378638576.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/85699798698.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/nukagivanomubusobijovol.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/7399608126.pdfIn PDF document text
    • http://rongqichem.com/upload/files/ritezodazajesid.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-4/20210904060217219008.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/94750947499.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407b52bad72---12411717368.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109091326099811.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/5237326770.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613248a450d18---dalaxovafawibililenet.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/89062541849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hungry+shark+world+latest+version+apkPDF 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_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 11120 bytes
SHA-256: 97fa4fdd8d6fadb566ee273274ecd28600349099ccce6a9234bf0fc61b99a310
font_01_sfnt_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 18812 bytes
SHA-256: 8302677048281ce34be115eaebe684f5f8979c80d0bc456e2d7ecc4502cb5a23
font_02_sfnt_off00012e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1