Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a76eff9d84cc10a…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 07:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fe25a6b444cf444cc4193c295063f78 SHA-1: 5a1c2e0140a5397ddbfb53c1c5d3c5e0550ed3d6 SHA-256: 2a76eff9d84cc10a77e93519798c316382c60d5c2ee15f6313ebdbcb326d3374
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adff54e20fa---30383382811.pdf
    • https://vannordenvastgoed.nl/userfiles/file/33132305049.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/gosofenig.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ikpntv1mjrcriq9n7sfol6g0lt/fefidubiloriba.pdf
    • http://ajivikafinance.com/userfiles/file/51122320256.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/vudipul.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/68skoqrnrdb5r3ejv493hvda3r/67642227716.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/cdc6bf982eea29edd154b92cef9cebba/35578945477.pdf
    • https://digireg.dk/upload/33987999551.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d11846ca9e---74448300407.pdf
    • https://yellowstonewildlife.com/meretofabaruti.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3580d8619---vuvexutiwe.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b08c8fa4d---tudumuzakewi.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/db48b013b2c7ba89f009d3f65fe4b2e6/kiwosufuvorav.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf33f3bbbed---gavitopuwazamogo.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160873fc19d37f---bitidezifomitimuxunu.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608335b6e9cdc---6100521940.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8543586ad8---90538388575.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be04e6184ed---74851469265.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/aca4a491fe1da38de371be991008d8bf/fokejatubokadu.pdf
    • http://pospatrans.cz/UserFiles/File/97358869580.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/57be04f9e9ac347a39c01be67341b53a/senadasewokegoparivasup.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b74dc4859e1---soxawapelaxisavajagin.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070b024728d4---29722931208.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=compartmentation+in+fire+safety
    • 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_off0000e9f0.bin
13c9d7a0a1efe60331d2466c72ef4d10206b7793e0a632f6f2b4f237fb5d9ee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 10616 bytes
font_01_sfnt_off0001023f.bin
f50f0a727633cdcc96b695ded34694a960ae744a92856356ad54773eff9554f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 16436 bytes
font_02_sfnt_off00012c66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C66 16792 bytes

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