Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f481d7297b8c571…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 07:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72fc790f7bf7543ab317eac0722ec63b SHA-1: b5a7bb404f41751a473c1ae718f78f3c19f0e0fb SHA-256: 5f481d7297b8c571a647c1adebeca9ee4d39b79646f3a69ef16694ce98b29f02
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=g+suite+administrator+fundamentals+pdf PDF link annotation
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ulqtul8rn8ljag622en7j5eeuo/bonajutamubudoxiseku.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1419f2e18---pemokekajabaze.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abb50e9d9e8---46687720885.pdfIn PDF document text
    • http://falerisztika.hu/tmp/lovujakaget.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/kujewu.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/bebivanarodozofebelan.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/a3b2239d94843379d573ce2e4bba3497/mukuwijivekawokurabap.pdfIn PDF document text
    • http://praguetransfer.com/files/file/81084986650.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9835f90a43ae3e80773e72bc36bddfb2/50298327896.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c12ff0c1a0f---lewotimowam.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/49adb5faf896eef2f6e8a09efee2085f/82017529580.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/99123388254.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/botalekugajolamajut.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/2071509352.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/tazavabotiviweri.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/rqf14c7mf8a3oa48au3vkqr4t1/rudel.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/getos5kdherr6qhsp4556qfb90/rewebibunadapiz.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3e190d79b---2142030963.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/zufuj.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/nogutojejobuneluv.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/89np5o56scikqm3ogae7oevfib/82348831866.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108bbdb43924---mapaju.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bfb32f09---34770716998.pdfIn PDF document text
    • http://mousike.it/img_ins/files/82347955996.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_off0000e133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE133 10796 bytes
SHA-256: cc547c457402abee2a8152cabb60bba07b33b311b391758d3b2e8d3f7b64003a
font_01_sfnt_off0000fa0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001121f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121F 17116 bytes
SHA-256: 6ed07b2b8e9a8bf6621f6310023acff638c894ea890822f92107f2e85337153b

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