Malicious PDF — malware analysis report

Static analysis result for SHA-256 0709ca423dc86a4d…

MALICIOUS

PDF

83.2 KB Created: 2021-06-27 08:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 804527d461c92495d217d88d684804b2 SHA-1: a8a5dd8339d8760954d285cc6d98a37f69e4a877 SHA-256: 0709ca423dc86a4da051779f413bfc3ab4fef031d94d39b8b5f410b4117487f6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware delivery site. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/013f3e27fcd9a713814ed70ff4a2e547/jafulobizerikiritawako.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/ucebcea6r1qof880r448fe21rb/zusate.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a385f657---litekesara.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/tovidewofadafokakola.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607badef02612---30236644857.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade33c55950---23541291095.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608271ac9866f---wowekuni.pdf
    • http://brixtontaxi.com/survey/userfiles/files/rageligotabe.pdf
    • https://dancleland.com/img/upload/file/54410045993.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083108cae0ea---fopat.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c325e957ec---kevuxo.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/v2tpd1s1dikjon5uqi5vdhso10/xitozari.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/fa91b6e22a304496411321858d0a1240/zakudidigad.pdf
    • https://f27szerviz.hu/upload/files/pexokurapazubu.pdf
    • https://wecareprogram.org/images/file/goxonikosalomaz.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3383f95f98---zakot.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5239b89ad2---25307542677.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebef4db4e2---buxinataninivibenelito.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f21d0cd0c9---69858618374.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160739f23d14f3---sotevupifam.pdf
    • http://j1medical.com/uploaded/file/2845153965.pdf
    • https://fullmagicweekend.com/ckfinder/userfiles/files/ludov.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6705d3ad51c5d70683eae4678a1de2f3/77048756602.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/30989007136.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/d4372919e824638ffb5365f9794fdca6/nejarifusapafupinuxe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+figure+out+limiting+reagent
    • 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_off0000e32c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 16792 bytes
font_01_sfnt_off0000fb3e.bin
f8e9f5e0c90839b4edffe45ec803c824bfd1d6d1efbb0e3453542b63ae084403		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 16924 bytes
font_02_sfnt_off00012727.bin
65643751115183f4cf4018f957b7bb4a75f9b6c3961fd81557cecf64f3b0f267		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12727 10568 bytes

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