Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87e4b5b776f3934…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 07:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bd1d5b373d72b6a87a376779898b9d8f SHA-1: c09eda0377ff1a0f82afca63a3ef6fb4d94081f5 SHA-256: b87e4b5b776f3934d172e68a1a655e86897c0022c80e776063ef5c1cd4824f6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to malicious content. The presence of embedded URIs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://smidgel.ru/uplcv?utm_term=best+android+calendar+app+for+office+365 PDF link annotation
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/84e83f454dfa6854a5234eafb15d159f/87517525644.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/gusumobojejubadera.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/tezutusaboledebab.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/texukudupepuvasudozux.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/17954451647.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/bipil.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/80253253411.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muwibegit.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/gsu7bs0dk3mrnvpkb56ore5l52/xokikemanaz.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/93683328678.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/54220835416.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/lugumikokuxawibin.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613149dca9a1f---wudarutifebarufupo.pdfIn PDF document text
    • http://xdankfort.com/rhnew/file/29542323543.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210922165742_lb9d1g.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/435587741.pdfIn PDF document text
    • http://kechengchem.com/upload/files/laranob.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/17024679622.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/22632581673.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/2f7d95f7fada859cb700f8f8d6635771/barexabidutirubizofad.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210905095433.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/effdc857be5b0983b827ef10b07c5fe0/zinokupemiv.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/xisidifadililokodaferonu.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/11083559150.pdfIn PDF document text
    • 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_off0000af87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF87 15356 bytes
SHA-256: 1b7db1f5767453c064ac3a5f311dca15b8ff6fa57570d40379a4422d6d2c7e7f
font_01_sfnt_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 11140 bytes
SHA-256: 8f171df4aeac2669a99f3a2c5fa23412213358101708459bfdfa45634d8ec7c0
font_02_sfnt_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.