Malicious PDF — malware analysis report

Static analysis result for SHA-256 5253e3d729347502…

MALICIOUS

PDF

89.2 KB Created: 2021-06-27 09:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1d68d218dca84c9bc3bf9336337d7f7 SHA-1: 42f2802b49e9f1b598734b15dc44b7d62cb3e792 SHA-256: 5253e3d729347502b93e6108a41d864b45619c328386970dfd291f812c9c5cc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which appear to be compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the linked content suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://catamma.ru/uplcv?utm_term=early+cretaceous+period
    • https://betenagro.com/sites/default/files/file/99763086927.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b45e0466e---66491422377.pdf
    • http://hitecds.com/userfiles/file/89938578189.pdf
    • http://zonazero.es/userfiles/file/16735905684.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcad228b3b---mezukuw.pdf
    • http://jucal.es/images/file/2168252581.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088c751c0ea0---83317590820.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/hkrjg3dig2dg074qik9hmj1bkh/ruludejigokalewakadu.pdf
    • http://hytechplus.com/userfiles/file/xujumijiku.pdf
    • http://austria-ex.com/images/blog//file/dimelujuwom.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/lhtbts8a2lb4g8b850iohsfr7o/suzevivi.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098594105eb6---19734668872.pdf
    • http://temple.mo/userfiles/file/80565058753.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/4bou0o2dmfebi0up8shk0alagi/zonitokogadunajileliz.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63348a281---27587376024.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/2aae695c2cdc339e10f646877b12acbc/banewemenixigozagirowiw.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826516823ba---39907731840.pdf
    • http://alkanboya.com/files/file///13328619713.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608eceb563e96---35353653088.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/umeacrjiivh73cvd133g1vl1ul/moborerurazuzekadixepa.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/f7rlu71b7lg55p2hia5smtq295/84945358255.pdf
    • http://alimentosldm.com/userfiles/file/fagufureli.pdf
    • http://hoangduy.vn/vn/files/16603675707.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/79qk3f00ukij7g51of7oe0mojc/87264346187.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/d9611ebbe4f713532be28a23843b5de5/repotim.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/73036751406.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_off0000f70d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 16792 bytes
font_01_sfnt_off00010f24.bin
92e83993a45db794875c6b4471e80c9626b022deeed80f7c1387d380e5824162
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 10600 bytes
font_02_sfnt_off00012785.bin
795153b90da3f5e3a80edaefaed9a2195243e404bcb6159b6cc6daa1686c8b06
pdf-font-stream PDF embedded font (sfnt) at offset 0x12785 18692 bytes