Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfc2ee05efb4921…

MALICIOUS

PDF

89.2 KB Created: 2021-07-07 07:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53a5568a936b7d9b9dd46777321e1c64 SHA-1: 028f822d716a61ec15e8e9b2f3bec866dbd81d98 SHA-256: 0dfc2ee05efb4921aa4f96ea0d8e30a9f9c97efb28ead7162a5ad2ec27fb5cc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=cells+affected+by+leukemia
    • https://guijek.com/userfiles/file/segimazulojiwomik.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d2058b94a220b1ac3dc0879e5df5d975/49088801398.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/21411a4ddb3154586dd490d17c0d1b04/senivolafa.pdf
    • http://blesk-stroy.ru/userfiles/files/30073651829.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcb1de3966---zoxaneguxare.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/99b887a1e9afdeb9b45889e568a60513/67610479507.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/fddd49fb5b21cc2b3b2c830574801ef9/75812219302.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52f631ec9a---36258951494.pdf
    • http://greenbrier101.com/userimages/23492001589.pdf
    • https://sindonis.com/userfiles/file/puxuvazimejotedilisexub.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1bf2259b52edec07f566ecf5a6cb0782/xeduwonutunijorekuketasul.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7df98ae7f5---zuzidomazupeduziror.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872148a4ada---luvabowiv.pdf
    • https://netshopnepal.com/userfiles/file/powegimaraluparegavomapo.pdf
    • http://ibtaker.ps/userfiles/file/96948996294.pdf
    • https://krippner-schroth.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074bee1a72e7---17638195154.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/dcddcf087d544979b59074585fa53507/2865056253.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1frkf7i79kluuvcghpp1lomk50/zobizivumegazunemodidifo.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c945d59ff2---pulonere.pdf
    • https://brahmagnanam.org/fck_uploads/file/tadokawegalanoxavu.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/08ab9bfc4e0c0f056bc7b4044f9c9863/xugavizizijivonubefi.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/um2as6pn7q9rl3tid91e29r0u5/39600353739.pdf
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/zujemusixexakulozararot.pdf
    • 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_off0000f98e.bin
bb5a7c53cbd361c46a53195afdcf1ebd32c713372e39e554786dd09c9e5e9669
pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 10788 bytes
font_01_sfnt_off0001127e.bin
5d701e31bf8ffb08f2cfe6f977d57b2f3e7e99af0a37285f0f2e766b3fac46e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1127E 17220 bytes
font_02_sfnt_off00013fb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB8 16792 bytes