Malicious PDF — malware analysis report

Static analysis result for SHA-256 95def9b6582ebed7…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 11:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e047665ca715bc7f4d9cd8f0908a2c79 SHA-1: 0ccfe81d54abcf557cc2eb757d289c8de8ba50e0 SHA-256: 95def9b6582ebed79a29685f0ec994a738f2c534e9ffe5c6a183dd5bca2d783d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains malformed streams indicative of exploit code and numerous external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. The presence of exploit-related heuristics and the link farm pattern indicate a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://queure.ru/uplcv?utm_term=best+android+games+like+minecraft PDF link annotation
    • http://bifruit.mk/ckfinder/userfiles/files/99385693167.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/75140964361.pdfIn PDF document text
    • http://myphamasia.net/upload/files/kukibin.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210916152834_8k5jhz.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/17/3155116399.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/wotitus.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/99045025952.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/66890705884.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/xovosutobowijo.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/42910743350.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/35845289157.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/jegad.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/13836797589.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/xerubivubak.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210914141007_1639195783.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0a2cf639daa127675dda8738f8dede3c/tevurimadotozekagonubom.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/dcf39c2573c38061f468185ad6bf47b8/gusukifijexukimego.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/53718461049.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/36049135130.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136563d28d1d---firevon.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/babinotodafi.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_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 10964 bytes
SHA-256: 4d5ebba459e2c3dcc926a1da1f7f3b6b95f322f4e3f2848b468b9eca17207d1e
font_01_sfnt_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 16580 bytes
SHA-256: b56fb99c08c7f21b0f7459ca9f0023f8e70ef8210dd01ce5e5b6fb6d44adac01
font_02_sfnt_off00013456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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