Malicious PDF — malware analysis report

Static analysis result for SHA-256 40947825a3db9d81…

MALICIOUS

PDF

87.8 KB Created: 2021-06-30 01:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dc7211563e5dd1574d7470a37dd96135 SHA-1: 441cd645ba488a2e01b77c479798c41c13b3ca5f SHA-256: 40947825a3db9d819a8694de8780baa7aa98a15cfb150c47c74cf84d29a7f0ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to obscure the final destination through a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/60cf0d5be2103c407f2fd0bae19f2e34/sapevad.pdf In PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/29de4132893f06775541bb63ff4238a8/39720594531.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/sorezo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a671340227---tozukirotatokidupigewipen.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/megoxanowod.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/21f2f9efc4ff1470af1377896cd5a544/97478886054.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/76u12s67jhep92dn6acqpkbb69/bopujagusixop.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ef96e03de---xesumurowupizewoje.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j2t9g5cijedo54dt5q023qhe92/kewizemasunitu.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/42680320603.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d468e281---70934952110.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/73940803761.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785215b715b---17047205016.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c994235da74---luxezerakasinumimoj.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/89103268265.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/idj1275bi7gmridp1bsk0llf77/81492445588.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/r6bs1g9fc0bdvmvt84u74ugi9c/46132955621.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d2edd4i7pgmcj00ieelhvj2tr/lovidufunazike.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/46399256966.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/zobisegaj.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/89418304754.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/21622267766.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fb3e9f458---zituxosodikeluwof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=3+facts+about+costa+ricaPDF 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_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 10360 bytes
SHA-256: 651fcf907adc517cf9fa0820a0843d32df97231b64bce0d41fb07fe6e84aff28
font_01_sfnt_off000109f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12203 17848 bytes
SHA-256: 1fd4f5e24c7fb80abbd216519b1a359b4c9b7c3faf5ac2f27c5af98833329e46

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