Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fed4963dfe2b19…

MALICIOUS

PDF

77.6 KB Created: 2021-08-26 07:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f77a68c57976147d39e4b6e06063720 SHA-1: 09cc6b4977a547698e1a88d3f4d9c605c855b231 SHA-256: b3fed4963dfe2b19fd5675406844f0407fa76bac7a6dc882f6503a0fe07f569b
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary purpose appears to be directing users to external resources, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6661

Heuristics 5

  • 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
  • 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://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8c2a21b42e969a4223e3083d763a4997/65370995603.pdf In PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c5af0cccbd7---lagalarufevitudepux.pdfIn PDF document text
    • https://campermagazine.tv/public/file/6946427011.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e9d7efd12---4634485655.pdfIn PDF document text
    • https://avela.md/userfiles/file/pabepipifoluke.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/zofipi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161164e59ba145---55516259837.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7a76a9bec---85794527707.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/benogemirifemakaroruvad.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/riravafajamozumemema.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/sepuvezasapune.pdfIn PDF document text
    • https://nicosiacaffe.it/file/79879422581.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7098e60f251fb24765805ec4833667db/586496259.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/38183405168.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/708a166df3b83017848ebb21526dd2ce/semeravutuzames.pdfIn PDF document text
    • http://azizolace.cz/images/file/zimosozaref.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84b77ba4a---dedurasojuvatiketanutel.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/35984580398.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbcf197e35---58729133856.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/xukisoruxasabejifotavi.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/a29c9ed79d875b8d175246ddcda93972/zujutujizizeveg.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/aomd4l9c03jnhja0bn57tveicd/39222641533.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160782992dc19d---27455867923.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/31868121518.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ff729195---wavenexolefewakubatofipod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=no+name+woman+questions+and+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED4 10672 bytes
SHA-256: 8f835d5baf28358f152789e946ff3cf53ef5e3a625b1f02c3f011a24a2d5f38e
font_01_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1