Malicious PDF — malware analysis report

Static analysis result for SHA-256 084422843470ed00…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 10:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 590bb3398ae578536429376bbbe93726 SHA-1: 1feea0ef118423b7ff41fefb4431847bcebe12d2 SHA-256: 084422843470ed005e14aea8c069a4bdb36b03941f615efb2956ab0be0643853
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or appear to be part of a link farm designed to obscure the final destination. Heuristics indicate it's a link farm on disposable hosting and potentially a QR code lure, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613b80ee6cc04---zexipaparebagelagewapur.pdf In PDF document text
    • https://netlandschool.cl/files/5605897897.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/miloperixiduvojot.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/36464746307.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/sujuxelukegu.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/58864263536.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/40504129919.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/53599391785.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/29876005567.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/renirebaluw.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/sazubagoraziravenibumigi.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/kubajetaju.pdfIn PDF document text
    • http://rilta.net/userfiles/files/54115213752.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/2477823261.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/xakavagexumojeniragew.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/qu302q6nac4uqii7lljju8jfg8/14339420702.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109081545405113.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/81852959894.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/ladivoxakadodoxisuve.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210901145016.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/12635775049.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/8d5dc8d69daa73690e9b89c2f66c0c02/romezaxinowomafeguvo.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/9266716017.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/77917302883.pdfIn PDF document text
    • https://nomortiga.com/contents/files/dafazuvaridodinagokopized.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+dj+games+for+androidPDF 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_off0000d8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C8 10836 bytes
SHA-256: 75c16a598773dee400948241bb010236724b4881f1e72f9061063857a9e9b71b
font_01_sfnt_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 16784 bytes
SHA-256: 296b3b72d573c2e0f616b59eb83e4231a1a7b38f461c7fca5beb4ee24fbb0389
font_02_sfnt_off00011c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1