Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbf72ddec02a06a…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 13:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8007f9a8634d7029827160dfa113394f SHA-1: a1965230d4aa1ba03103a902e4f9a17a2629f900 SHA-256: 4fbf72ddec02a06a792da4ed66b4d4df447ce053c83253dc5bc1f05d41609d2b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many pointing to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and a link farm structure strongly indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://sosonomo.com/ckfinder/userfiles/files/44021614248.pdf In PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/gitefepuwanol.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/someporoxifef.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/lurefimixodo.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/24803284080.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/98120832375.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/vijikemirarufitufeweted.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-17/20210917125913295519.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/34364308213.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/30759389630.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/lomuselutopikixorusose.pdfIn PDF document text
    • http://hkwwta.org/userfiles/60776554187.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/wesesituwixila.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210915140321.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/38087966706.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143711d55a72---gemuvuduxevor.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/ruxovete.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/tusabonudafimefamofozeb.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/budoz.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/68337870220.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/4171b696badc7962d4e2544e09016b9c/loxizov.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/wejirawizopijanini.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/qjb5jq6b6gmv2n3k4676llfv6p/tujibaxaw.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/bcf650204ce8637e45bbaf4b520ae20d/46617185784.pdfIn PDF document text
    • http://sswjeans.com/files/58288992937.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/jezototudipaximirona.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/xasuguved.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=big+time+rush+online+freePDF 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_off0000c721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 10652 bytes
SHA-256: 7f269d7eecabdd3aa9a7dad6402149cb46290f547dc471d05ac8605b8e50c139
font_02_sfnt_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 16532 bytes
SHA-256: ad6d8ae890c0900d8b1d81cfc4e475ddd013b35d48ded4ee135fa8ec872793fb