Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0449bf5b4093978…

MALICIOUS

PDF

78.2 KB Created: 2021-09-06 09:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 27ca03af5f323878ff281d10f1c69faf SHA-1: a9960632b228ca0b36fe625e1ed4460e7893280f SHA-256: d0449bf5b4093978d6c4089f9df9ba827bac2469660d420e3f928cea353d9bbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a ML classifier and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the ultimate destination and evade detection. The primary attack pattern involves luring users to external sites via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a904d1d78f9---40919767005.pdf In PDF document text
    • http://hifitness.hu/userfiles/file/dalowinipomimox.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/98502579014.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ac53d5f1260---54268332842.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/76307aa7c1da5682055c956542dd6fbc/7444955237.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/bf20f5a3b936ccfb43d5d0e38735c8d2/41907081537.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/83t24d2vi97t0nm3bqcgu4beg7/94620728643.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075445b92f32---fupod.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/bowisopusuxogomimuwoza.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9h1437aqsofj2lpiv605dlf524/89950001250.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/somojegig.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/2542277698.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160de39f9dfa23---67742355987.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/gatelazofutagarufumobeti.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/bezezojuvepikabonito.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/59456254963.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/58566371493.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/febixidikazixaguxa.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f03034c60---tinaperivowa.pdfIn PDF document text
    • https://marigabung.com/contents/files/jupapegijibidovojidi.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8be01f5dc---wuxupetek.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/xigufenutowakezomevixudaw.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c52580acc3---telobodadelabewitazogev.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a38e5b604fc---vapuduwupikanozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=winding+of+three+phase+induction+motor+pdfPDF 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_off0000cbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB9 17796 bytes
SHA-256: ed9fdf524bd84421b0f6fb8894de3ff6bb7920d752db017d69a56eb144c8c3f5
font_01_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 11112 bytes
SHA-256: ab7972bfd8ed96bb32cd49105ccab7fa4253d569037f2317fd999dfc1d2d56f3
font_02_sfnt_off0001134f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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