Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e904145a2991fc7…

MALICIOUS

PDF

73.4 KB Created: 2021-09-04 22:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f17a2aad232ba6a4ae5745bd4e32d132 SHA-1: c1aebf7c4a0481c6255136547de20f0b82e647ab SHA-256: 7e904145a2991fc715ad05dd7aa4b8a140adc017e31e699ae6ee76e825f247fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which appear to be compromised CMS upload storage or disposable hosting, suggesting an attempt to obscure the true malicious destination. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://classicalgardenornaments.com/uplds/file/wumofejunizi.pdf In PDF document text
    • https://viboot.com/ckfinder/userfiles/files/66545345033.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/17717989276.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/vorag.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06f2bc9dc---nazujuxebuxawizeke.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/panokubuduteramefole.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c29c2a4be---85150122413.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/86762332649.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a271c6d298f---gudefosa.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/62817918346.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/xuxej.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d27e60c70e2e6bd525391548dd431955/rokanukukifubupelatuvovul.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/vitivonujipofof.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210817_83C03EA22AEA1802.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50eec6b6d2---medana.pdfIn PDF document text
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/61444200754.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/xufijevedevisezi.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/93332016479.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/64d862e90addf8acbcbc15c4eec482f0/42741357638.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609164ec063de---32855785226.pdfIn PDF document text
    • https://securitydm.com/slicice/file/muweparudetagilebonokir.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/tipekokedajoxonuxawemewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=conversor+de+jpg+em+pdf+gratuitoPDF 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_off0000badb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADB 17144 bytes
SHA-256: 38c8400f0a71d20211af1190e7d913180f84efad7a7d8e9c22b57259e939937b
font_01_sfnt_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 11120 bytes
SHA-256: 2c19217171ce59affd76fbfff98a2b07474621fa03a606df9f410918bb58d412
font_02_sfnt_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1