Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0dfbecb0aca3ad9…

MALICIOUS

PDF

82.0 KB Created: 2021-06-30 13:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83413abd715302e07ed4b9d48c382a69 SHA-1: 26b5d30879303716a854d8808db79c4998a40381 SHA-256: d0dfbecb0aca3ad97da1c3bfd14819bb405bb5d124f9efc28ac873e3628c4f57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://carmakers.cz/userfiles/files/pazusape.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a4460759---35815773957.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/44d1f655f29c37efff334dce4308b40f/72334451906.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607583870b9ae---bukazowerewaso.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160839ebae7953---zaxitun.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/ca1ed2431490397fca4242f529937808/61733506545.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ti3pgaptn5budtnba6jkitvvt5/duduxezaw.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958b7b4cc89---fubosusinama.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/51e62ba37353113cc923309f3e888779/10821562859.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4ebd42dd3---88357351937.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160712e1f81f6d---vemakiwawodiwixafutasat.pdf
    • http://apsara.ru/userfiles/file/15749657182.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b815c43e9---virabirurajokujenuwore.pdf
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/gawojupulilafarozuvepat.pdf
    • http://tanriovermensucat.com/uploads/genel/files/77312381307.pdf
    • https://greenlakepaint.com/ckfinder/userfiles/files/lelarova.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e74ca7b2fe---28478416053.pdf
    • http://qunjl.com/userfiles/files/ginij.pdf
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430194644390720.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/a04a0760779fcd3a8c530a6ea5aa9d0e/zasawez.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca9d83806b---ruzevupojosebiz.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160828eba4725e---xelowevenida.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7e667a89006414b8716838382663b1b3/vuwatelejudigu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=even+odd+meaning
    • 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_off0000e176.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 16792 bytes
font_01_sfnt_off0000f98d.bin
3c9d34d35615d5329e82cd212c15f79a22dae985e5be5bc5eee4d58f578e4a1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 10228 bytes
font_02_sfnt_off00011039.bin
094bc33ce35efcf2aae37b0285be944d95bc575091d829285d632c878100ba56
pdf-font-stream PDF embedded font (sfnt) at offset 0x11039 16672 bytes