Malicious PDF — malware analysis report

Static analysis result for SHA-256 399ec4bf96c3420d…

MALICIOUS

PDF

76.0 KB Created: 2021-09-20 07:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cda3e5326137847388326da5499c12d8 SHA-1: 377c0d18af54626859795540ef2f13d8a684123d SHA-256: 399ec4bf96c3420db1d0e966a41b13c01ca823c129d987c1400ae66d75e3c843
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a phishing or malware distribution attempt. The presence of a link farm with UTM parameters further indicates an effort to track or lure users towards potentially malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://smidgel.ru/uplcv?utm_term=truck+simulator+pro+europe+download+android PDF link annotation
    • http://thermcom.cz/userfiles/file/lupejejijepafoxu.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210919121238962318gycmcd.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/55632404478.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/62075461040.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/sasonon.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/9714558868.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///jupotobenadijowa.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161472900dd1af---25392394244.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/zozub.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/65310117181.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/99868719735.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/lefafozed.pdfIn PDF document text
    • http://dezis.ru/uploads/files/56768832127.pdfIn PDF document text
    • http://puisan.ru/uploads/file/60251568568.pdfIn PDF document text
    • https://moscreen.in/cmsfiles/file/62493826858.pdfIn PDF document text
    • https://asiapharma.la/files/files/58961848213.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/rkvp5b743a90o23spka2gc1h14/desuwi.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/30625634230.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/fatose.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c1b1a4603---46218540247.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a48fb3920e---belilaboxedebemar.pdfIn PDF document text
    • 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_off0000c4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EF 16924 bytes
SHA-256: c52ada2b5dd1a69be2a12a0d79570ef77e716d9dd736d41289559848e2567532
font_01_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 10916 bytes
SHA-256: f154800c6768dab9ab626737383c58fe6803c58695b764d404b9caaa8632a2a9
font_02_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1