Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdc9ccfa5be5723…

MALICIOUS

PDF

85.4 KB Created: 2021-06-29 23:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f35911901d55f73da5dddbc05643ece SHA-1: c425fe703eef4993d1900bd85148fd2ffa4a93f2 SHA-256: 2cdc9ccfa5be572364b4118b227f7823a3177c6e5ce5222a5db785c6532dc7ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories, forming a link farm designed to obscure the ultimate destination. The presence of these links suggests an attempt to direct users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c87aa73aefe---88020159639.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f316cf7ee18aded46597a7d437d92eb4/fiwemebu.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d81a0991bc76cfb34d3d5e7ee17ddc15/5441153062.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba799ab7be---janelatazakagew.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2275cb34---dasisalirunilitefarewar.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609665297ec54---gujelizozomeda.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/6a091d6902b26aa7f9ef0c12137f2a32/28951887751.pdf
    • http://grandchainfamilyfoundation.org/clients/85333/File/jikegefejomarolonojufez.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/pdee4grbaprhuuarlegervd359/83082824295.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ba78f147645b63a87e4579db2b78a2b0/34650912578.pdf
    • https://gruntbudowa.pl/files/file/pibifasamegu.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9f06862b1---gepikevutovewavodovisoso.pdf
    • https://rimsball.com/ckfinder/userfiles/files/50098029358.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835ffd42b1e---jotenivitugazatudexa.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ccd9a3b7qc8p6jjp5sjercjp7/1763333858.pdf
    • https://arerp.kr/data/file///febowusepe.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095b79925e9d---64648608394.pdf
    • https://oddluzanie.net/userfiles/file/13495056353.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c03f876049f---maxabubemi.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/37k66lqe4vpv48fn00t5qc0417/jegolelasofadez.pdf
    • https://europartner2.pl/uploads/64427133578.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde04feed88---xurivonona.pdf
    • https://rzfmuhasebe.com/userfiles/file/fiwujewugebel.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=oath+of+president+article
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb83.bin
d78828dcc5de04551b2b8d9c6c1bb666e84d3ea6fd5cde3ad472eb3bdc7651d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 10740 bytes
font_01_sfnt_off0001042f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 16792 bytes
font_02_sfnt_off00011c41.bin
1bfe762504db1e6d1fe2e4e92e45afc6377f14c3993a331c75b9c0617480c2fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C41 17196 bytes