Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d4aa22347e455a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 18:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02ce16591d15543440d8f1bdb0d6fb9a SHA-1: 176ec117f912b08f4ddcd1a8f1bc22bf940b28b8 SHA-256: c0d4aa22347e455a28de704871921b856259b221a341c93d5d78d67d3267f690
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct textual clues about its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/wegavudolozojatubigawuta.pdf In PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/20250638576.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613946d998e22---46050481399.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/vadagutabikikoze.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///83429490227.pdfIn PDF document text
    • https://samudra99.com/contents/files/gogojavopubijiberapumoje.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/doxakuvulotavotifegaki.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dad429378---dikan.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/muvupuxuruvukiboj.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/82272045147.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/29356322798.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/fuxirebefaxulog.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/zixixekujakuwawug.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/bixewuzer.pdfIn PDF document text
    • http://rapet.hu/files/leburizufevog.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/pogomivagamapo.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/46007416032.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/didoxanivim.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/74937542363.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/temikozobogusito.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139caf6a1a17---vesezonoxebulunifo.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/bujagezipagemigagibetosi.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/derezisu.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/82199782724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=draw+a+stickman+epic+3+pro+apkPDF 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_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 10840 bytes
SHA-256: e77abc0a7956724c5bb965e8140d2b572a0cf84ca4ea44420e02e568484227f9
font_01_sfnt_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 20428 bytes
SHA-256: 010b1c6403e847dc2177b3ae3aad81b153d0f361d6bad71fd783b600b0720be1

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