Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c97452be54b155…

MALICIOUS

PDF

86.1 KB Created: 2021-07-04 23:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41e77d1af9657c0f1cfc2c0ae5c7b647 SHA-1: 61ad9b6da28262520106e77403008f92418137ec SHA-256: 65c97452be54b1551d7f1c8706b5f6b03b34c2a0655716e8ff3c5a0f194aa114
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the suspicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bikeid.net/ckfinder/userfiles/files/37340892633.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819b4b9a638---56465805758.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffd16d8288---debivofef.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/6f7a3c2a7fc769f46f6debe16dc65d13/15127458308.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee395042f2---gelapisoxeso.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/jadosomafer.pdf
    • http://progfin.pl/userfiles/file/farixumisuzipujubegudez.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc23f4942c---45640744279.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609188ac6d87a---68619716402.pdf
    • http://short-story.ru/upload/file/52601121013.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7dda7486d93e5e922f49fec1efaa4b7/zizavoser.pdf
    • http://romanakladatelstvi.cz/userfiles/file/50287461863.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084f928ed16e---mojilurejesiba.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b52e11cf7d---48808887000.pdf
    • http://www.pattyn360.com/upload/forum/files/68430325803.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44351a6de1---23452833050.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d1e4ab596---mexitafafid.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af62140f860---84820785989.pdf
    • http://jingluo.net/uploadfiles/files/dosadevafopox.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d49babd56b2---seletagu.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/c3ocbml209gpergbhqc7m1l096/bivajox.pdf
    • http://brmhn.com/userfiles/file/20210605110803_63g67g.pdf
    • http://accessiblevehicleservices.com/userfiles/file/sorulalisisomo.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/baf836dffa0041c6e646f318fce41d6d/34152676093.pdf
    • https://n-zvuk.ru/upload/file/60050609188.pdf
    • https://sindonis.com/userfiles/file/47050042742.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/faaamiu86h1ir68b2iimki6633/litukerali.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b9794a437---lawuraboxisevazafozufexo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fable+4+ps5
    • 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_off0000f06b.bin
4313c4b8187410574c936494579a64f3821a5cf94b4d5b0e382225f826701c4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 16924 bytes
font_01_sfnt_off00011ce4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE4 16792 bytes
font_02_sfnt_off000134fb.bin
e99234b99a23abcb0b2b5e5758540920ce8a847f0c2e0f6d98821a276a108f60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134FB 10060 bytes

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