Malicious PDF — malware analysis report

Static analysis result for SHA-256 96845c7a7ae89131…

MALICIOUS

PDF

88.4 KB Created: 2021-07-31 23:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da4d402dc5003fde0cea1b11ce827f33 SHA-1: 9f46e9d5fadd4440f1f8103e05b49c2e4c65471c SHA-256: 96845c7a7ae8913159a3612309315d8db720a871966fcb82d046482c35cbe20b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detection and ML classification further support its malicious nature. The presence of multiple external URIs and a link farm heuristic strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://tyextractor.com/d/files/95456669667.pdf In PDF document text
    • http://fueandhair.com/userfiles/files/50148438704.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/80899478189.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/genitazavuba.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5be54027---sujusowewomakenivigodi.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a233f43aa2855da299ea0375e8ad7edd/fofegudavobeledamas.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ef6ced012a07eec3081331d3e3fce6ec/zijuxolizapujakivikutur.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/81118381294.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/vetasipirekarejowus.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/8a0mu29v48fklitt5ep78r41e4/bodur.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/86247775885.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/11404056890.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/65076525541.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/velewazunasonuvenujetevok.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/35f183a6f353a8fc18dcf14aeedac498/xikakumogedazu.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/17172585643.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/29677141863.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/fixibibidudo.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/50602581812.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d29agnkfm20vu812p2mi5oik12/simaw.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84142ec734---24363386384.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/083120f29c6bff2d7d86bf2aab0e38ce/29011700315.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021072813560973499.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/baxolakerejovegatan.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/95409670442.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f746e445e2---disulofag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=apk+mod+free+fire+bellara+v11+anti+bannedPDF 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_off0000f620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 17156 bytes
SHA-256: 9accf3f6a14129b442bf16dca445004e2b9d140f250713c782bac1cb23cff6e8
font_01_sfnt_off00012317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2E 10820 bytes
SHA-256: eb1120bb84db2d549925516ce1a0b4f7d61f69147092ca99a5a90f60c19b7a47

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