Malicious PDF — malware analysis report

Static analysis result for SHA-256 da987ae37149cdbb…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 18:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e0aead691d5eab582efafc4d5d0bc0db SHA-1: 350fc23ebe54735594cf038e0d1d6b16d2267be1 SHA-256: da987ae37149cdbbbe175940b47117c1ea3006f5d0a6cd0f7f8df3e05b68ae6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2569282d32---12743018623.pdf In PDF document text
    • http://tapestry.cz/images/file/files/lexozo.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/mujejajoxuzanila.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/gjb76qq120rasjkr55mr7ma1gq/40193917910.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/84126550475.pdfIn PDF document text
    • https://j26clean.com/upload/files/15321305387.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/23895568512.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddeb18de0c5---lepemo.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/8694903188.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/8938029383.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092db1a624e4---9225930439.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210705030129.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/7352127167.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/gopexalitedesagumunabirid.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851abfeffc9---60139629517.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/29107800847.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zitobidutadovewerebagu.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/23867252898.pdfIn PDF document text
    • https://costarica4d.com/contents/files/96333066972.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8f3a193349e8e975c3afee18b7d7bc3c/9844971451.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/245ec84225ee452dfda5f5f1ee9d3134/pidujogi.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/74f46893139d23a5d3e1a92501430bd4/30845149471.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079b724a3502---vafef.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/7fa600ed86cbf26559357f8c0df64915/rejawalosukasote.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/46154865800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ac+generator+theory+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_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 17040 bytes
SHA-256: eeb93a7c6e6462ea084910b6e212d0a3fd34e8005418b3349f2dcb645e1753aa
font_01_sfnt_off00010140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 10688 bytes
SHA-256: c7597c0237ae0f8d03aed05be3cdeced5fc7a4cdb0fa7d32490144b5fc76bb26