Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0161122c5897ae7…

MALICIOUS

PDF

85.4 KB Created: 2021-09-11 05:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a8e9ce65e0e5d64aea41b863d003895 SHA-1: 95ec88b72f8518cf6ccace0e3d46d77224c34202 SHA-256: b0161122c5897ae7bb9578e7467bfb1ca95ec020c98e8fbc5c291dd2bca6ee47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=office+for+android+mobile PDF link annotation
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/d20abeb411e2df1d95b4953e4d886205/wolawimusunup.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/8064427295.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/fepozibidupeduditevilelob.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/32957708079.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/niboraxifoximo.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/gofinaxufetijalufono.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/50793226548.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/foteril.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/mogamew.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613969a6b6e5b---fugulepizafipox.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-9/20210909130722432320.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/7860717259.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/86044456284.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/zunal.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/88356113851.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/70358100932.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161345ecfc86c6---zitifif.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/28376143283.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/nidixawotum.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/58750211734.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/kojinoga.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/vamutukekatuni.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/15419584406.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/epbu196kcdg1ar8h0trb5840v2/wolob.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a4730cb1d9dd560bdf68290d3edcc091/ketisox.pdfIn PDF document text
    • 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_off0000ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 17908 bytes
SHA-256: 5cdd59618ab194641a4bd9ade9e3ca0a0e177709147be6b01b73b73df83a2bdc
font_01_sfnt_off00011864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001307b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307B 10536 bytes
SHA-256: bf2eb7883582bf6585399def5306a2288a15c9d24d46d8d08f80b6e28c806c21

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