Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95708fbc8bfe202…

MALICIOUS

PDF

94.5 KB Created: 2021-07-26 23:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 857ca57624b9dc5e6f0853ec717cb3c1 SHA-1: f002fdd1479807941a2ea141a9ba44c06302ba83 SHA-256: e95708fbc8bfe202821e68a4fb4b9896660e3af9fcdb296f4957c7bf16d40b01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://bebsulmare.com/userfiles/files/pawipojizanatezogamisojax.pdf In PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/fb185ac55953087e35c0f5aa9bd4b5a7/nabuwij.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607078f98c63a---92143446013.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/8a8e33bad5c90a980503ea2488e3363f/83595891190.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pesab.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/tujonokigoguza.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/wenod.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57398ffe3---92055552914.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210727022256940746lsuotv.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/veloxoku.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/d5f36f0eca9c3dba1508aace933a414e/14804067370.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/dunagomipegesirekubuzulo.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/78159765919.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160730b2a2c214---81922220052.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/183be8019fba0cd5937af57ad6b7ef66/3526026552.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/begopapow.pdfIn PDF document text
    • http://kme-kme.cz/files/file/10309473449.pdfIn PDF document text
    • http://dges.in/userfiles/file/bolagezukesepovinufa.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/detopikibuzisaninubep.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/50569521585.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/razaka.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/61367884363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=atoms+and+the+periodic+table+study+guide+answer+keyPDF 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_off00010ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE3 17428 bytes
SHA-256: f3020cdee9856c097d9b044ba9bcea41bf5f69b35ade824036c3378f04d9ed33
font_01_sfnt_off00013876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001508d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1508D 11472 bytes
SHA-256: 91fd7e202019608f92afd48ec2cce94a59c78856bbc50068c2a2797d7478d82b

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