Malicious PDF — malware analysis report

Static analysis result for SHA-256 1468dad26c83839a…

MALICIOUS

PDF

125.7 KB Created: 2021-07-24 12:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2297aa8e10e7bb368057f13515d0a3b1 SHA-1: d5cfe4fbab4de39667e2d308ca18b3aff2a0acdd SHA-256: 1468dad26c83839a7268939e138a6f702ce25153b74935a91c8deb7bf5cce8c2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number under the guise of resolving an issue. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://sanvexe.vn/webroot/img/files/loririruj.pdf In PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/vcts5avskql0acj95uaqsu276u/gokubafigadetuzaf.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/lejesagiruto.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/metuwesekixab.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/nebezov.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/9dkgb0qinlj78vppbfir9d9tl2/55869985725.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/n9kbm2176l9tg2rdtn3kj651ie/32502589227.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160982f4576c72---foraku.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wakegofoduzumas.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/46539643496.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d52852c5a---98420296200.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/bepepuvowazafegezinekunid.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085659587175---xelirudiloxule.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070103d32c07---waduluxezifuvimo.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/51288811298.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/47560301166.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/juzuxamexitu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befcf4a9271---14100158816.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/favunukebolexuwo.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5ol5jo7u40sc5ogf7eoplh7a5o/tudevadogufagozen.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3d251d54ec7b6471d4e89b2e46f5ff46/72289174664.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/09386fff8b46a4f9e14c1625528563e9/xalijiv.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608586df422e0---4601961079.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbd084a6f---33032449542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=keddie+murders+autopsy+reportPDF 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_off000189d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1E7 10608 bytes
SHA-256: efe0eafdf3ace02c4d3dd8778709b6cfa47f1026656ebcc155a3c7f32a68955b
font_02_sfnt_off0001ba31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA31 18212 bytes
SHA-256: e0c5daf3b16d283dedb80075bf9f3274fe2857c6488a7b9d4500a709c9139c21

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