Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fd0c0f00a19c5e…

MALICIOUS

PDF

90.6 KB Created: 2021-08-03 05:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e66afaefe8703f9d83cd52b39c92fe24 SHA-1: c30c8423b0145919f6b81013fdd2859b42c77fb5 SHA-256: 55fd0c0f00a19c5ec69aba5f3cf746c7afe7d97ca9dc6292e6c97baccc1d5159
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious content. The primary purpose appears to be directing users to external, untrusted resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://straps.by/ckfinder/userfiles/files/64846168907.pdf In PDF document text
    • http://atek-ent.com/upload/file/28791753606.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/aov3o7e9mhpm228u6ernptgv45/jopajogudewipapat.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/xopalabakuv.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b128825807b2da3a79f023838d8fdd6b/90110344028.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/37c5ac8fb21be26da803b199f504e356/64876694716.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/f8d53a321e3eb71a85602800063249be/63918464225.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/904jbrl38rlhe4gj9a770verkp/gulipogarodepodurot.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/25616920477.pdfIn PDF document text
    • http://agro-partner.com/Image/files/79703558051.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607807635f7e6---pagataxivirajunazapi.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/orucl0fp58aocvld4q9ngjfp27/subamag.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/57845bae47c943e007b7861487a7b127/xumufuni.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/79052422315.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/bifakobisodaveriz.pdfIn PDF document text
    • http://cctsjwhs.com/clients/0/08/08395bc9c2b8280888f0dabd04457394/File/liruxunolobavimilatatisoz.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/5leaq0bfbf208epoca83eia8lb/sogixakoto.pdfIn PDF document text
    • https://netpage.info/userfiles/file/35136974906.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b383cc98eb0---43841609871.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ab79b1971627c5c62e33143b2244d0ec/kegije.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d415fc666f---zeduzikexapalewejogiji.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/4909c246d30d583dcf1253f5c55e0ccc/kaniforixizonisobomigo.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/xezolejejovijetanefudovi.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210516221004_1514298995.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/kadegomito.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/e4b09c9e28671c4a1996923cdfe5b9c4/sopuzedenozolin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=will+hicolor+highlights+work+on+dyed+hairPDF 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_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 17896 bytes
SHA-256: 693cb889af0b06704cf463011b5d05fec5ce6883b8130f199c7223d29a90f531
font_01_sfnt_off00012ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CC 10932 bytes
SHA-256: a5456817237cbef35a844bdea942afdf2d30fa7cd6f9c796d44ebfe304ab87b5