Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c1512961204dc6…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 22:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 659a90416508615950236237052d92eb SHA-1: 2346bbcf0db249c6e3ba02a2efb2b5d181848358 SHA-256: 64c1512961204dc660d6e2a3b8f40f82733241e88f6d814208df8230bbc92585
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links on disposable hosting, further supporting its role as a lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aep-tc.com/cache/fck_files/file/zavuneniwuma.pdf In PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/427sec25n8sel9dmmec71hdfho/mapimolapurawoxigamekuba.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce3413e135---debobi.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/pazatoliloro.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/32922759142.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa92d395bd0---vetememuzof.pdfIn PDF document text
    • http://vhshf.de/File/parotapenebixupimolunipi.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/52238044076.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee64c8cb17---15045724652.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/1c58a539e258b9b63e136c731add1226/79677206576.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/nejidugaxisuvixiriwukiti.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/93120070189.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/pevosatazufiwapenowa.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/7km4p7h8c2ta5v6p97bovkren4/92752897541.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/32480168763.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/6464138508.pdfIn PDF document text
    • http://www.toptehnik.si/images/gevigusij.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/cb75a73acd0d8b351964696a56d1e130/tiwuko.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/3b0fbb510a62cf8b05c14cd9508093af.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/zobokiligoxuvurixafekix.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/96340901662.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/tikagiw.pdfIn PDF document text
    • http://soc-in.com/data/media/files/17885872032.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c3f0576d---39094107481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=marx%27s+theory+of+alienation+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 17912 bytes
SHA-256: 2881e70ec295dd616a3cbc64a4606a4787258f1912338db8e413d2fbeaa7a076
font_02_sfnt_off00012267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12267 10836 bytes
SHA-256: 953c56db4ffddcf9c43de5accec09a5704c40f49da072f92885c5dea8f7bd5ca

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