Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cac408e83c4959e…

MALICIOUS

PDF

73.4 KB Created: 2021-09-05 07:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6e31b7b959de7d1a5ce6f1eea6183b62 SHA-1: a33af8e00c2576a488eac2d1a1e4829ec0ee5df5 SHA-256: 2cac408e83c4959e2b599044002386dd00a1083cca771293b5b55283f4c41af4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://digifast.cz/userfiles/2966804112.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe19f0eae5---86449636481.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/sheh9m29k0mluats0vu0emvak6/65979657491.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/99141687175.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/fivogagonulutojajuba.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/xetotawa.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/59875674285.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2ecb52081a95f2383e2542d70774fe6b/87513491977.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/7274492207.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/91924241874.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/depujotugajedanujaz.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608129dfc0975---16251652078.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/50581533242.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/8223eb33bad3a3734a61112e2c314bd7/95911778422.pdfIn PDF document text
    • http://hrudolf.com/userfiles/17448816066.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991689553c6---97285340645.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/439ba98fca151c435340396a804de5fc/ramatavokojevatapizesoput.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/75281993982.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/wokipabubosabezuwem.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/vexuwawutekokuzifekiwelib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ikea+hemnes+assembly+manualPDF 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_off0000bc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC49 10360 bytes
SHA-256: 098877b8785fc08c949a2d76ef4054960afea944db64d7316dde3667ad56da14
font_01_sfnt_off0000d37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37E 17324 bytes
SHA-256: 5433c39fae7711f037a92eeb31cfb75c7ecf0a29b5096d2595361364a62c0077
font_02_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1