Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfaee5e0ca4692b3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 22:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5d0b892ee304b09fac0801e6db38c686 SHA-1: fbb5ae9b30f6e987ab635c9284e75eb2b49a3938 SHA-256: dfaee5e0ca4692b3d05a9afe64d44edceac9f756e3408caf67a41d52b9f8f4f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple URLs, including one hosted on a compromised WordPress site, suggesting an attempt to obscure the final destination and potentially distribute malware or conduct phishing. 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 http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc3f8e1381---pexowozijodiku.pdf In PDF document text
    • http://ser-buk.com/userfiles/file/gexisa.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/61241452035.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bbd650564---gujubijegateziwu.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/xedonedana.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/31868625217.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc75d6711d7---25327059012.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/rixoredusujupukigasix.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/sonawuvunoviruvefawijibo.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/95497018966.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5b4sd0tnbh2qmuaoqdgimmr2q7/papolefasobogudufu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c49a33e805---gudalaraxes.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609e32e50bb5f---48541495405.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/xiwagejivijazu.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/69057803508.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/neditudamu.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/jafewa.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/1629471386007.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/75703876086.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sukivel.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/89ba08550c329793f274a8243c061beb/81791110509.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c27f4f0ae---fumaraxukijadereladoxu.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/891766f041847120aff63423d6079b76/81349927850.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ccedfb7229b---13342626439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=post+office+recurring+deposit+form+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_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 10856 bytes
SHA-256: 51311d76378ca314cb839f1fd50068ba039f6fc960ec947b5ea953cb9a0af93d
font_02_sfnt_off00010c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C71 16908 bytes
SHA-256: 06dcfb28aed160caa470bcc906970dc77887b7d0cdd8dd8e22014231f8d52b0f

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