Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d1b731eb41bf52…

MALICIOUS

PDF

151.9 KB Created: 2021-06-26 18:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f3bf66a2e1bcf4fa8449ac3fe09f622 SHA-1: 693d654a107118882807c81718835f4c0fa2319d SHA-256: d8d1b731eb41bf526a74d1090fe28eb7cc45994fbaf7dad967b492b6b7ea9cd2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to PDFs hosted on compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and contains no readable text, suggesting its primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laflammerouge.ch/userfiles/files/12828863601.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daef880a22---fivofavuluxi.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/dc3b09c1509c1f23cacb1bee5096ef54/96179138134.pdf
    • http://ahkjt.com/upfile/file/kolazugutidoluramunatot.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/136429308ff068a3d99cec3924dd6037/18741274534.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/89dsrm6jrn62kp3vkgq6lri5uj/finelarulegif.pdf
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/nigififetefonudijevimabok.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cc780efd---lojujuwebufugazoku.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/282da32983b67806b3c3bd1b35510259/mezakavawumutomogajote.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93f8d5b0d9---3288921625.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d1d23da23da2b3c4d59feadcc384bf53/pumiwojekutebikaluluv.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/869e96d4be52d0277d2be7345e976c15/73499237936.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/4bea5e364a53ef57769728768cf1ce94/76910923461.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e27dd2d077c9547e3f41467df999f4b7/dafobedodewawegudogomo.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/6817c35568495440f7ba02114a1c0dae/29831655423.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a801edebf8a---nutilodewetekufowamoj.pdf
    • https://villatoscana-pi.it/userfiles/file/74492755378.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/7i9vdsrkupftkb8ru7tlmqhku3/84936535929.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/6b0564e32cebc0f7bcd1fcfdc8f95d86/dipujojerakixonevadipuro.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6a60fee14b07b7b39ad18bfd0e3e10a6/218456138.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c004c6e8268---gejezokaboko.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+kill+dragon+on+high+wall+of+lothric
    • 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_off0001f235.bin
cedd7bfd8ecd292a0ab759dea3903fa633de90937b259d98663dc7e8d59e9aa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F235 10624 bytes
font_01_sfnt_off00020a31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20A31 16792 bytes
font_02_sfnt_off00022243.bin
66cd8ee98c297c25fbb277f981f8d85a9070a56992e8787dbcb6400f94eb3296		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22243 18172 bytes

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