Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b62035968d8a7f…

MALICIOUS

PDF

89.8 KB Created: 2021-07-21 22:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 822a80988959bf98d50b06ebcd4f538f SHA-1: 91596cbc958cfb232f9e523ee186e8d35b0362ce SHA-256: d9b62035968d8a7f048d10933e2a057eaefc39c10ea00d44d543d74cd7c9788f
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 utilizing the FormCraft plugin for file uploads. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The primary function appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d651a4a9d49---govivogegajumitokomejujom.pdf In PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb48ba7967b---kodilekumanepewiv.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/drjpk03mm3slik3jlia1e2lqd0/patutokugawogoja.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/171984445660f10f1bd7372.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/19900708981.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607878842a9a0---rofojegeboveriwekawesew.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d910da0605a---85671614558.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/41722422000.pdfIn PDF document text
    • http://abpaluso.com/upload/file/vareno.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/53npamk4fpo515ik3040p584kq/zojojep.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/boziranurijud.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1203876e25---kupurutamarijotom.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/zibol.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/fiporoxevojutuvilel.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609eff8cc8d36---wuvotakukov.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/58916287934.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9133ceefa---29757353670.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/6kinqkra4q9idsre07hpc9mma1/13554047345.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607197382573c---48903881045.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/rokaw.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/41296299704.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106120546027130.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e9246502195a1f4fcb90cd4e24fadc59/37637796085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+will+take+permanent+marker+off+plasticPDF 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_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 10916 bytes
SHA-256: c2c2224606b1e2266a827befe5ab644544ad4a7256966556a5f7fb4a325aa8f0
font_01_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B67 17648 bytes
SHA-256: dfa347f2f998b07d3df9f9987ff34faacaf27c7d0457defe6cc8a97ca14d5320