Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c476743df5b6cc1…

MALICIOUS

PDF

83.6 KB Created: 2021-08-29 04:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b38098e67adec6c10ddf242bf70da2a1 SHA-1: 6ceacd2ed3ff4ad942e3b14db18e3f68544e4677 SHA-256: 9c476743df5b6cc1947e3222c92afea211647b3a7d5ee1d39bd1879bc65d48c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://stradatextiles.com/upload/ckfinder/files/59045197460.pdf In PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/muxivenebemag.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/2978675881.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2a2a7ce5b---66516700974.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/dedojapunotitopoxixawiged.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3ee15b87d---78445322501.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/70946803140.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/laxuzosurozejafutosojesad.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6f32d61218---murofudelima.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160806b75efa16---lapuvakojosaz.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/15294010298.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/vowegejegefofudo.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d2b0651f7---57671841754.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083d844b2dfb---figovisawefejoxav.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/fodopuzinagarawigoxu.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/43717607606.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/gumavisijekol.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/zemasokarofifuga.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/manojegubifawumozovemega.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/2029080075.pdfIn PDF document text
    • http://derma-dts.de/files/file/sarekawanab.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/92228193612.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7c9c7fbef8647dd62d8d3e259f729a1b/zodobetinipotewabog.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608796482aca7---77835425269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=order+of+the+marvel+cinematic+universePDF 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_off0000e0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 10932 bytes
SHA-256: 6f1900397b8a38d3346a661d4833316ce6e807b52795a100f1ccd076cdc16ff8
font_02_sfnt_off00011211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 17844 bytes
SHA-256: 1cda4d3872f85dcfb33ccdf22dbc0393ba8956ae5be73abac2b4ab170eee22e0