Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0b966199dfc2ed…

MALICIOUS

PDF

102.6 KB Created: 2021-09-06 01:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5a58fd4ade1ec51b2cec83f2abb64db2 SHA-1: 8cbdeedb63372f75764b6b96a2083ad534f8591c SHA-256: 4b0b966199dfc2edad8fa84366af5776d37828a8451889c6d839cab13ed908b9
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites and disposable hosting. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of distributing links through potentially malicious or compromised infrastructure. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect the user to external resources, likely for malicious purposes such as phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://adamant54.ru/userfiles/files/vavuwiludawufatusudexuko.pdf In PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/938fa630158d2883e5f3ca3b7a7d8fc3/69279694593.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ff2e0e936dd969bab4ec866ba4de2607/jerijinufo.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/85047392968.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d7aa1e4c07dcb3642eab2635f1b97931/kewevuzeturimomiza.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9254153e07---55025143423.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bc54819c9---64203891468.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/getorufevisiz.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/16755816530.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/koxozov.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/roneteduwugi.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/99071263057.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/98622537069.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161353c2ec9865---46185203435.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2e4fa5a4a9515cae287d20c108163914/38688724004.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/4s7kk14528nmq2sg3pu0b77a53/6004632802.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/37625436356.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d69ee55dd0---82597565571.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/munilazimuzezerejamifila.pdfIn PDF document text
    • https://kildevangen.dk/files/bewegujivudapamugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=paradise+lost+pdf+book+10PDF 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_off00012d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D83 10796 bytes
SHA-256: eb5503a8436fa10a13317c9e70c3ccb0765943a9ec945d8c1bb23a31b9b1f58b
font_01_sfnt_off00014646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14646 17948 bytes
SHA-256: 79b03970dc0336f8da425303e9800372542517a902299cf21c6291901cd73ffb
font_02_sfnt_off000174e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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