Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5b61b248f49f58…

MALICIOUS

PDF

72.5 KB Created: 2021-09-06 18:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3047e54bff1ad049276ff1821f4191b3 SHA-1: c70038c774bdffdaaa739e19665a372dc2dd2c06 SHA-256: ed5b61b248f49f586512b302d674ed822189e93dc2ae043f10fa0c651de99bbc
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying a pattern of non-clustered links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://eltonltd.ru/sites/default/files/uploads/83834984098.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094970153c0d---witilamevaseb.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/95628109325.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/o8qo3e512k8gr89l2vm9fak7f1/41858476882.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/vofavitujiluzawawa.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/vutitedebijelimulezasofo.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ba2a2cca46d11ff56cef46218aa8ed3/dawaraw.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/padef.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f50c5a7b7ce---gutozoxumipopameweto.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/80216197065.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mikedijobibilirexopofivo.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a56551949e9---degomupofadamibut.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/361f3b287f9180e1e630b8ffb8034855/96514860313.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/jodoxe.pdfIn PDF document text
    • https://facades-metal.ch/ckfinder/userfiles/files/dufoz.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e6e62259c425b299c5c879026df98826/83849536015.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a250fb945c7---93390223068.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/81735079695.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160932de7d6978---63960036913.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/tuxoni.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608aacaeecd7a---60959810595.pdfIn PDF document text
    • https://defi128.com/userfiles/files/fulazunedinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=plant+and+animal+cell+coloring+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_off0000b840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 10796 bytes
SHA-256: 5015e64085237da13118d55b388f3c35325d48c27bc3f0a1d87908636d4989ef
font_02_sfnt_off0000e8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 17012 bytes
SHA-256: 431b66a4c96574bd8b751b6560ba1feabc5e632691a1478ba6db57b9e73a7a47

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