Malicious PDF — malware analysis report

Static analysis result for SHA-256 530b6f0cbeba4d10…

MALICIOUS

PDF

80.5 KB Created: 2021-08-16 22:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81b68d7c2fb02ef6eb143dd458359033 SHA-1: 00c0c58f245aed6a22bc97c9cbed47160a0d107c SHA-256: 530b6f0cbeba4d106d767efe4bb14a9c40e2c235c7fb19bb5d4dac0b0d52004b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for suspicious link farming and duplicate object bodies.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://shyjjc.com/v15/Upload/file/202185158436294.pdf In PDF document text
    • https://lexconsulting.ro/webroot/files/media/53301469446.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/gedalawagaju.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e237e7b7d---22301159137.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/b2479e536829c97f1bc2cd74f8fb7d79/73746676715.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/c7d25e4f3c812148d432698a8c9d897a/74325162253.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eafae04cb---wukikezulop.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/11334896546.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/15861616472.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/timodarote.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/57769502818.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/libidebotavaxad.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/64b6f9960d719dc54ba3e213d7d3db00/felejutefutak.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/44452970821.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/8685764469.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0b031588c---pepofe.pdfIn PDF document text
    • http://afro-safari.com/upload/files/zitepelipeke.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/50820270300.pdfIn PDF document text
    • http://klinok-saintp.ru/files/52177347353.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/voguvixu.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/44384964683.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/3q9avfvtf4nv94v2kn74lbqmv6/92832920088.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/72164397687.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/kisilutojagituwazogat.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/57574233678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=algorithm+design+kleinberg+solutions+chapter+7+githubPDF 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_off0000d144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 18988 bytes
SHA-256: 72a98f8042d56c57c435f6fe47546ea88a0a493fd75d067e9bc925e6c1b46000
font_02_sfnt_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 11324 bytes
SHA-256: c61e6a2f87fdea17989aca3d0e0ec407949ac65bd4341cba1c9218dfad3709f3

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