Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d8334ceb1eee75…

MALICIOUS

PDF

88.9 KB Created: 2021-09-17 21:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 761e7c1b5b849410d2e3d6ed0ca2574b SHA-1: 01ba93b49a1ec76ff7d6ad5b06d36ac42b3b5bed SHA-256: b4d8334ceb1eee754b6d512da20a0c547cabc50542af92ee0d693e567dd14cb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tractortools.cz/ckfinder/userfiles/files/66726459018.pdf In PDF document text
    • http://gayaarchi.com/userfiles/file/20210912000103.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zenewasuj.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/wukomalonaxavasisebuba.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e6bc9771304bff98113a9f8707247873/kumax.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/82395704928.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/toxipudulokoraluvegol.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/kixafudamo.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/74434cb13798c42cf8bf14d5f5184133/93116679043.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/kaxel.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mudejitakebepapixu.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/menel.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45162350602.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/5677090373.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/xevudowovaxogumusuwo.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441759a29a2---43288474728.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/tubovomutav.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/40974997242.pdfIn PDF document text
    • http://ombs.ru/uploads/files/xujupofibalanibalixedutog.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/44767344502.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/84251749696.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/zosinugadoxaku.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/38395097197.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/jenezamatabiwix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=re+zero+season+2+free+watchPDF 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_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 18884 bytes
SHA-256: 5eae5bcc113bcf53bab1fdbd6c5bf5ced2d518b3c392b5d373af0a7091643f8f
font_01_sfnt_off000125ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC2 10608 bytes
SHA-256: 655076f0c3b8d9748b62b0fb3be752641ad75aacba34a6c6ffcf99171f0203c7

Open this report in the interactive analyzer, or submit your own file for analysis.