Malicious PDF — malware analysis report

Static analysis result for SHA-256 b652908fda1ae22e…

MALICIOUS

PDF

86.8 KB Created: 2021-07-08 07:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 853ccb7268c40e4e89b910a4245dd9d4 SHA-1: 836f493d8f413c0b107f9c6bc396981427f5d22c SHA-256: b652908fda1ae22eb24dd3ca2bb40ab520abe1d64d9a23fbf69c2b6b5a1a62e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely serving as a lure for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=personal+assistant+cover+letter+pdf
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/85210851540.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/kipewekejovivasi.pdf
    • https://fallsplat.se/file/kiten.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a72d8618996---pogax.pdf
    • http://2sisaccount.com/userfiles/files/nozopajibinanalo.pdf
    • http://gleneaglehoa.org/images/file/54402608115.pdf
    • http://e-hane.com/files/73862357596.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a784392715e---19436222514.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073e296e26f2---foregokosaw.pdf
    • http://esoftland.com/userfiles/file/62638912625.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffe04404ba---getuvifali.pdf
    • http://phuongdonggolf.vn/app/webroot/uploads/files/visaxiruxuwe.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/0eb70f773c71bfa4d9f4532b85666cb7/lexoneruwegugetokimif.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7530b65dd---84765349332.pdf
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/4eec35163d79c9558413c761497f7a3f/womadogoza.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fff8ace35---86847305024.pdf
    • https://esprimagroup.com/userfiles/file/15547852620.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/3uolvt9nspm41ahil667r780nf/katuk.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/17bef1dd13b73c7c77ba9caad641504b/48431089937.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e319c534d7---buwuga.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ft89v7i97c9ema3ata1pnsatlf/34689913877.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/0gnmssfpldcrrlde5ulle29p46/32980523061.pdf
    • https://cissud.eu/uploads/ck_editor/files/16524286155.pdf
    • http://travellightnepal.com/userfiles/file/litubixidisezat.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec48de6c96---61148746357.pdf
    • 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_off0000ef21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 16792 bytes
font_01_sfnt_off00010733.bin
47c3c6a524e2845dcff27d880d0f2976a87f399dc6051a263cee025b88c0a891
pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 17300 bytes
font_02_sfnt_off00013394.bin
4b3dc17def377cde0ae8c45b74e3e9a559888aaf4068ba9822a37cf7c19e7008
pdf-font-stream PDF embedded font (sfnt) at offset 0x13394 10680 bytes