Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8379d570d5c8e0…

MALICIOUS

PDF

85.5 KB Created: 2021-07-07 05:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 686746ad10127af9e28a87d906e97385 SHA-1: ddf46aeb6f34dfbdda26a9e7d628ae930276365b SHA-256: 2d8379d570d5c8e00c8ecc1dfb33d5555aead889edef17be86150319d0d42cdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm or phishing lure. The embedded URLs and the heuristic firings indicate an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

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://nomylo.ru/uplcv?utm_term=how+to+answer+what+are+your+weaknesses+and+strengths+in+an+interview
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b568343474b---sajimamimerunabed.pdf
    • https://juhaszautovill.hu/userfiles/file/komutujesifilejisutiki.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0f73k7cpf4gc1nndikcp5gjvr7/70427321941.pdf
    • http://ck-kutnahora.cz/gais/image/file/33900039081.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/8mvs3isgji49inhvuc57sgqd0h/8125508467.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608be1db144e2---mibifuzanomaxesugune.pdf
    • https://lesura.net/userfiles/file/10122483825.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/cd0e71c6f623f620341f19e8cdda25e2/71439071198.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837eec12ce1---gatizobuzelopevomotafo.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a1f5db13a---sukokiva.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ff21050ad---2109243095.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160714528c0e0f---xomuxepilifi.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aec5eda0ae6---pesuzezutonojuzetefodo.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744b73897d4---sadukagivotevev.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3cca15d82---minugegip.pdf
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/18518449797.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0687d3ae60f7c1eee39f45608902e370/95241248908.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/kme49tmt101dpp7maqou1be55u/27295450161.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tgid5e30ttmtobn4nsjcuo6497/21220609006.pdf
    • http://abwcrainhwy.com/uploads/files/bubimubabewori.pdf
    • http://on-video.com/movies/movie_data/file/rexubepiwegofirazo.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8usf74dmauesktdpegtni18cr3/352315026.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/4cf1uu201ou0uhsu7v6f8ukjdm/35437587680.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_off0000eac7.bin
7daef4133f38140dba0d44dd1c0dc07a0d302fcd0a374a4591afbd5ce4ec2b4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 17008 bytes
font_01_sfnt_off000116e9.bin
403b449d7d21ddb10deff67ecb15559150dc75f957a33deea3054f99489fadba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116E9 10928 bytes
font_02_sfnt_off0001300b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1300B 16792 bytes

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