Malicious PDF — malware analysis report

Static analysis result for SHA-256 0957f806a5be08b7…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 03:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d12e585e97796567784c8778906d0844 SHA-1: a075839fd3c8376f7534d21e73dd2d94bfe5eb6e SHA-256: 0957f806a5be08b7d21dba0ac0c0bdb9acb26acc74de2118aba80ed611d8af36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains. The presence of embedded JavaScript and a high ML classifier score, combined with ClamAV detection as a phishing trojan, strongly suggests malicious intent. The primary goal appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://synerhu.ru/uplcv?utm_term=ninjago+shadow+of+ronin+apk+download PDF link annotation
    • https://easypayindia.in/userfiles/file/butorevum.pdfIn PDF document text
    • https://webrobogo.hu/kepek/29137981773.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/26825098856.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614265052f91c---tuxovasufakonixusuvat.pdfIn PDF document text
    • https://sitarasign.ir/data/file/mukizisejonelavuwiwuzik.pdfIn PDF document text
    • http://contelex.it/userfiles/files/kejopipelabometalubojesa.pdfIn PDF document text
    • https://parkettworld.com/upload/files/41822294236.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/tupidi.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-12/20210912135655611242.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/zeselabedet.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/67531096725.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/bokovupedasugenewibut.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef59079e2a---76216244292.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/tubunoropogibabume.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091606571473499.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/meravitifipogidaxojobe.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7ff977bc5---mebetefuserixofojojovasoj.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/97915836849.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/tigenoxanimowubovafefuf.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-13/20210913044717548841.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135cce61e87b---63673644049.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/69746024169.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/42413074806.pdfIn PDF document text
    • http://www.polni.si/Images/files/65545955085.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/93142040406.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/8628107853.pdfIn PDF document text
    • 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_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 17368 bytes
SHA-256: 8060353f82b8e55ad0c98d2b37d962168e63b9afbc606cb234d56a1eec4855cf
font_02_sfnt_off00012297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12297 10832 bytes
SHA-256: 6a1581d9ecea999c8d19878ed05881b3f92051c64ad9c63af59b5045e9beff8b

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