Malicious PDF — malware analysis report

Static analysis result for SHA-256 138d78c15036fc27…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 09:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38f5c18161ace28f1caab10f127d2e1e SHA-1: 4275d127c1208c023ec2debc190cdb634a243a0f SHA-256: 138d78c15036fc27bf6525a191d67e1f0343fce02ed4ea81ac69f31dea7df1e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

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://cructi.ru/uplcv?utm_term=general+safety+manual
    • http://veoguidecostarica.com/ci/userfiles/files/28244901252.pdf
    • http://holidayservicemarsala.it/userfiles/files/gefaboduzavog.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/aa40d9bc216eb2071bf8b7abda6d95f4/leduviwexibefobiba.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/5b9420b1a8f7a046eeca9d210996338b/deduzazatezofibategoniso.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd32a00dd91---40735514255.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bb4a0261e---jojeminibenajo.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/mrdojlcbn99618hpn1rqlemn6q/19031708410.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5199de45b91dc321022c4b631312bef3/kujolipipenuposixuxi.pdf
    • http://epsilonsigorta.com/files/5695415354.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb6dfd701f---39328892205.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/t7ttc0nejs240bdnlmq6hpdmii/99096542273.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09ee6bbb19---nirunixizojigetagi.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160883401281d4---bevofesan.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c43ac52cd6---62199522569.pdf
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lezuluzofasapidufesiz.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1lbmevt1lllmlsp4pbu7tuleq7/kokugazefexuvewuma.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/i9ts7eber8h8s1e0mi0fo7rpeh/waxusa.pdf
    • http://www.tomasjelinek.com/img/pub/file/vumifogada.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092c9ec57720---51363310278.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/9f3dab04dfbc85413d30b37addc747e1/lobofenogilevuwifo.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6569dc24f3---47753161607.pdf
    • http://championshipsportsrings.com/clients/23492/File/tidekede.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/245c2aa314e625475d6d17961ac521c6/99534232443.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_off0000f082.bin
b471107f2964c5597def1ea669f8d552531d509b0286f7949a4a028b7fa70ab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 16892 bytes
font_01_sfnt_off00011cab.bin
2c2da27002738df2793fb790ed1577536e0f144bcfbffcf1959d7ad35e81acd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 10416 bytes
font_02_sfnt_off00013457.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13457 16792 bytes

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