Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdeff0945bbbe3f0…

MALICIOUS

PDF

100.6 KB Created: 2021-06-29 08:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4638347d77fd9bc2aba0bff872a4ba0f SHA-1: ad24ac358d752cfb45d315cb788d9486484b1eef SHA-256: cdeff0945bbbe3f0c98566b30116ca4113d120babc1a76e9c9561ec551840bcd
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many distinct hosts and links, suggesting a phishing or SEO manipulation attempt. ClamAV also detected it as Pdf.Phishing.Trojan. The embedded URLs point to various domains, some of which are associated with compromised CMS uploads or disposable hosting, indicating a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://ctkupavna.ru/upload/file/tenidedamujovexubipuje.pdf In PDF document text
    • https://cape-electronics.com/media/file/sovatudo.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/466144884.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/fonixoxebirotemiduwuvi.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/263adc4ba5f15adafcc0851b6f93a588/fenisugimafukuzuga.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/39049329969.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b81fe994a9---tegusi.pdfIn PDF document text
    • https://eternalbliss.net/file/83342187288.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/77451393252.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e968d4746---dogavazunakufu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f09f9a823---dipeweribusi.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/dc4bb3927b720af6417c2ef142164cec/wegobarobalidonipiwum.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/48c0175511bd8eaada7c52defb284c27/76677299710.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/584699e6a4049e8351c7dc15d22eba63/76132413308.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc53e49bb5---73641383876.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cc6bd805b---pafafi.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/gizozesufifilizorox.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/siripitavudu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6a0c6fc59b0be84aa2e45067a7a70a80/41070493633.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/i0dg26c09id4dtv4g1f9c45ol5/difufufoloj.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6ac1bf8efbb01aa96fa60e12ba8de82e/remuvawafuko.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/874h9ib79ht8g2irvq43r3t6k0/61380249378.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2a9a3584---31708428751.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/79876935025.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a61fde5c19f---pexurijemepiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+make+a+pdf+smaller+without+losing+qualityPDF 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_off00012165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13977 17748 bytes
SHA-256: a1da3e7eb0801d65e106740354461691f91de42e189b4e9f1f54d1db8bb34c00
font_02_sfnt_off0001687f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1687F 11472 bytes
SHA-256: e68e5771cd0e9712cd4fe94e1b14843f0081c1c82882753dfdee28438c9e6c05

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