Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd03644dd64d4d9c…

MALICIOUS

PDF

86.8 KB Created: 2021-09-07 07:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c343325a50a3ea254cc97d13334f547a SHA-1: 61e0ce047383acf68cd94c4a73fbf5409bcff040 SHA-256: bd03644dd64d4d9c139d55e092f5e117cdf128820937f28350e2a8e280e58273
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/sewixubixalulov.pdf In PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a35a83ac0cf---bekawa.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/fuvovilipejekanufal.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/safufixe.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210620201355.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210829103338.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c2a6ef5a3---6827572668.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/378747fecad8ba003c67a3b082c99a72/zusiralumatiwawejipigokad.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/aae81b37b156fda171f3b6bd4be79532/57203789546.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/37517450316.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/43cf327f772f565403f15f4e4269bc1b/77122293656.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161293c3b66b9b---pevagatujitazevomen.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/3788282893.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/nizozifagadiboxurem.pdfIn PDF document text
    • https://btegypt.com/file/63004802219.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/56648896632.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/batofilinizasav.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/bumeturaperaw.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/lutefe.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/dujajezojasopevosekul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=steam+boiler+control+system+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_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 11108 bytes
SHA-256: 53b99530293c9fc5f7960898ac3edae5d9afda16277be7cf06595fd38449f153
font_02_sfnt_off00012168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 17052 bytes
SHA-256: a7a20dfab7d611139c9d6fbf9406f598c8e2602acd2d1ac4d09929f613119fde