Malicious PDF — malware analysis report

Static analysis result for SHA-256 09efd22273074456…

MALICIOUS

PDF

85.8 KB Created: 2021-07-16 13:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bcb6a3fedec7a6c7ede57e5ef5351a77 SHA-1: 0a228e75f3b19330ed98f57c535ed341afdfc464 SHA-256: 09efd2227307445602ce7c9a6d448777f30eefb9f3539117d312bb4dd9762be9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to host or distribute malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.
  • 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 https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd6a78d849---daxabulewuk.pdf In PDF document text
    • http://tuclubcr.com/campannas/file/53500583815.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea7f749259---zuviwovun.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/nuxofamakefisejupoto.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/tojtg1mg10sp4k8hgs12oe3uhe/ruvifopebag.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b63dc20149a07ca70e91622c063b233d/poguzogufawinoramob.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/53770050296.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/79775358902.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5e033032---mozotijipejoz.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/nezitefurutoloxexonine.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/kizutozububegujur.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/8587287629.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3f2c90c6cee3e0341e487d0d8aa8b063/26028422362.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babd6b727b5---robubu.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/97991081252.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/2nti3ja15bd1643mj0bekiuah7/62717639784.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0284a75669---xupilojil.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/33680ab31858ee98c8c96eff405f086f/30295968365.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/nopinegaje.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074286b65887---58539829687.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b622f0437424aab420ae7fa6e99c2b0b/80068253936.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/suduvotinazezatupo.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e004a2a28a8bd17e37ab25ca67855cd1/gazodolizuso.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892482835ea---53300211659.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/pobukomu.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/2455701945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=living+in+sin+poem+imageryPDF 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_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 10588 bytes
SHA-256: 822134b46f36b330b00d8b8ae36b10a62ba01b8e4ec5799a4159264a6ce7eac6
font_01_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 16516 bytes
SHA-256: ee9595ed734ba95534ba3cd7206062ba88b1defa5f8ad65f4c16003551ccb863
font_02_sfnt_off000131ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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