Malicious PDF — malware analysis report

Static analysis result for SHA-256 f730d329e65826c0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 12:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 100548e75be50d376a3ef14c4bbce5ef SHA-1: fd7beaf2331ec16eb93f0be58d182739e1767df1 SHA-256: f730d329e65826c0718e60b2a8c19ec3214c26c8dd81adb7efee9f5297163158
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/h161dnu7o8tum8e646tto4nhds/rokofek.pdf In PDF document text
    • http://minicabii.com/survey/userfiles/files/15040495675.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/80357787704.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/fekepopitelamek.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/tukibodilap.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/levigejoselegul.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa6e38683---ninikisowiduxo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6afb7448c1---10604920540.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/35839248281.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/30002259528.pdfIn PDF document text
    • http://industrialdevices.in/uploads/furimur.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91cd2ac1116d0c939b6d8e856edea653/popakofawelisarajit.pdfIn PDF document text
    • http://hanleyresources.com/images/milelofotijoxixase.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075757088c24---zazuzulagawisajapokiwax.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/271423433.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/24311396012.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/gekitaxodugizavabapidinod.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/50075896182.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/m45151cdjeghjfsdujg0afp7s3/81343820673.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/68411000c36a616ac077c1d769c290be/54991070337.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/71980878844.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7c348f7012086bc2e74b7c2c432a9b47/xadivexovivemopudelodoga.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/5190901581.pdfIn PDF document text
    • http://www.pilartangguh.com/file/jufugo.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610427094f9e8---47517039722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=hcna+security+pdfPDF 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_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 10652 bytes
SHA-256: 5339e467a5ba31c1624eda133f6e300ad3492f493e44ff76ce3412be6271b6a0
font_01_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 17896 bytes
SHA-256: 48fb2bc4ef1606389815d85269db2e1c17d287899ffe3ff326c63a0231433c18
font_02_sfnt_off000123da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1