Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89fb178e9ff6d24…

MALICIOUS

PDF

102.1 KB Created: 2021-07-23 01:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 06d96adba01a9fe9ac324a27b3ef52bc SHA-1: 5cf5c193d3819dc4e5d053174ba8620c23f85a81 SHA-256: b89fb178e9ff6d24141347a44fc70ff9e7105b660a935a6e0553d901c27d9248
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites and other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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://aelma.com/sites/default/userfiles/file/24504714320.pdf In PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/m9rcocsisrjh4n3san019a4kc3/39812891443.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2b9b7706f---wizifajirib.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/gusuxigimil.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160893766cd48a---kovajubopanozoleke.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608af6d4c7b4d---vuzotivaluxamutedokugax.pdfIn PDF document text
    • https://patc.fr/imagesfile/kazinuzogirokerigenad.pdfIn PDF document text
    • http://techbis.pl/files/file/72343923467.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/28304319484.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/melad.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075caedcbc8a---zanubexevewuwewujoxisifu.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/rixenuguwaletejeni.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ec958e291---23257542929.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd093642e9---lepes.pdfIn PDF document text
    • http://hanifeugur.com/image/files/57892088208.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b25b69b6bffeaf150fc8aa48dcbe5a85/ripumutasawaki.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/wonokikofabili.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/rufitelupi.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/78608249385.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/punatiwomirubosewixibo.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/goligetono.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/7089154133.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/83990632715.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/3799147d7164dc488309bd481a37cee7/pozoluvoduzize.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/55407146960.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/23984421446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=top+200+richest+man+in+the+worldPDF 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_off0001283f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14056 11072 bytes
SHA-256: 76705410cedd4efc3e640d3387af16b6626f9dbcbcc3a8225cb84de81152bc17
font_02_sfnt_off00015a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A08 18228 bytes
SHA-256: 842016ae279a43828432ff6813f1ab93217a5f744a5290e9d0bb8e3df86c5b6f

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