Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b2f15c1dd6b684…

MALICIOUS

PDF

87.1 KB Created: 2021-07-08 05:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 01e197c265d3fcec7d6ce8f2a8e0e0be SHA-1: 109ad6db102cb4857f191327cb8adb4b28e4e4e8 SHA-256: 98b2f15c1dd6b6847b67f399c1bd11552224d3d6915363a97638ca5ed436f15e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to other malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and detection signatures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://dolaodong.com/userfiles/file/67840613721.pdf In PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/818dc734607d84d74129e21da1c838b4/98494334701.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/52b5976f040cee3dd55aae94fd752795/tafafokugenudakanolem.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/febalusejuw.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a589328eaf6---nekumibijob.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/vubazepotakone.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/64866721109.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/89173144276.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/c45d5ca223118b7d907d598ab3e8c7e7/48455619267.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aad65a08e---6444934570.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/38782889307.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e03b95932---laguzejerigudisozop.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/522d761921701319baeff440745f68c6/gazonebew.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/814b4939fb05164a467513a05c94b766/21185623037.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/7234421703.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/52302565802.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/xozepavebeteriwupajesopod.pdfIn PDF document text
    • http://moristas.com/userfiles/files/woxadujuf.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/53747555493.pdfIn PDF document text
    • https://ahha.az/userfiles/file/72070403980.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/17jn194gt6jdkg9l1ftd02em3g/tijegelutamipidaruka.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd50611fe9---92284986553.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db337a85038abe7aeeecf014edc9bf65/kexiroguxagapikigomiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=stink+weed+picturesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 10532 bytes
SHA-256: 55a4e21d660ec03156797e8a39b86e3b57f365d26fc59c41fd21598ce4116bc2
font_01_sfnt_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001235f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235F 16908 bytes
SHA-256: 3604bc3bbf79c0933d31116c6ce13b517e8888844a5419f10695fc5c7cb58916

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