Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd23e913d5793915…

MALICIOUS

PDF

79.3 KB Created: 2021-09-27 17:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d280cdb34dd3971d88525c96dcc7514 SHA-1: cb2133eb5ee37a70420092227b9e35d1544106ca SHA-256: dd23e913d5793915def6d6cd6dae0b7aa948603570cdfd7fcda9e2ee4b5e79bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://oniceh.ru/uplcv?utm_term=gta+5+cell+phone+cheats+helicopter PDF link annotation
    • https://calendarsunrooms.com/userfiles/files/12135224993.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/40303234303.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/supalimoxitipivizosapo.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/wopuwi.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/61041701259.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/nazavugumigavepetusufud.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/vinibiriraxiligisubiv.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/19714256497.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/bolajoj.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/54778336840.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/mojirozujixaxovevogowula.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/zigiwepifawutamalowumeg.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210905_92D42C24274143E5.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/vejiberaxaxozunuvuguku.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/24357172592.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/92233512978.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161476f55cecb2---76765285638.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/dugepovikosikutepuvo.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b35d53402c---92368188781.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/pinirivilumor.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/41040711247.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/veneburebotem.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae457a1b2---punerugumiboxised.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/f217e730338c35db9d6f137a4c5ac419/81173209264.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/77365121791.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/61372175707.pdfIn PDF document text
    • 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_off0000c6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 21612 bytes
SHA-256: 93788725b7287dc5578acde6a5e9ec8d74aa5fbedc72aea35a0598de4b0917c3
font_02_sfnt_off00011777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 10644 bytes
SHA-256: c49d9ad87d4bc0d51b4768e1d6adab3c1007bd38add23d9f0d03fa526d8da73c

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