Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e18f64a1439da0…

MALICIOUS

PDF

93.9 KB Created: 2021-07-03 14:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fd7b4935b7b34a461478eabbc9c1411 SHA-1: 941b9c0f054db7b216834903f729ad37768ddef6 SHA-256: d5e18f64a1439da0f8b827900184aed7e0e0087a2f54cacb0cfff12d7bd969e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous URLs hosted on compromised CMS uploads and disposable domains. The presence of external URI links suggests an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

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 http://coimbra.hu/uploads/ckfinder/userfiles/files/puxugagevuxamexaba.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/7bba8a3e6b3ff394773f0d6a22ad624a/tamisolijege.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/tmb9pa60nale7a1spqjiptj0l7/80963936979.pdf
    • http://ackerviewguesthouse.com/userfiles/file/veliguravamuzevuwusek.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab353cd9a---36521895127.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7h9natgu3oi5jscklb7ptunhc/ridupisakodinamorov.pdf
    • http://humanitool.ru/userfiles/file/nevirajefomuli.pdf
    • https://cmoretv.com/userfiles/39768054069.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf65a6674f6---23754180394.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/3a7abb0f69b2c5202f4d60211bde4811/52354785225.pdf
    • http://zaun-produzent.de/userfiles/file/jukokorud.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e823a6558e9e813b04eac205cd4ecd07/wokitem.pdf
    • http://harasim.cz/uploaded/files/gibibadisos.pdf
    • https://mfdesign.hu/files/file/jetuzuvenifaxibapulo.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9767e8f311a3832e498a71a9eb75e1ba/mawipi.pdf
    • https://cgeminfos.ma/upload/file/75732358603.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03158270d3---dejiwategogo.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/27e6417ed74dbbc405a96480613a2764/54383793880.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c3d165ae2f7292924d8f89c7df19c54b/losutedod.pdf
    • http://balogmihaly.hu/UserFiles/file/45616688601.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/qgq4m0lulsm3lgi74s8mj7o0ai/80042185955.pdf
    • https://ludifrance.fr/userfiles/file/miguguwegim.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+answer+how+are+you+in+an+interview
    • 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_off00010ae8.bin
cb3e3974215f97560e7310393fa9fd179fd80885d58457876f2b8a157b195d5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 10516 bytes
font_01_sfnt_off000122d9.bin
9ae5be177e13f1806c4b494995fd4f02ee7065333102c84445d1ada9665d867d
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 18000 bytes
font_02_sfnt_off00015236.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15236 16792 bytes