Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf48778234910c9a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 16:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d6c296c7b768df4abc7687c6f2cbaac7 SHA-1: 01a4eee86f3148d24b73edb4e9d3a5c06ae740f5 SHA-256: cf48778234910c9ae4dfe5c8c09c34300cc0f59b94bb46c4b9bd2b8eab60171a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous URLs pointing to disposable or suspicious domains. The presence of these links suggests an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://pixomot.ru/uplcv?utm_term=l+cisteina+anidra+pdf PDF link annotation
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d194870a3ed---xuvoxeso.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/25980685741.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fklpu06t0tc5f8vtgojhp8te56/kezafebozixi.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/nurafosu.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/xubujapafiru.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/15819984434.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/fezuxajigazemuxubaruwetar.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/68072900361.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609485152464e---mufujobejiduvedunamo.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/33801907876.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/fasojukijo.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/exogijajatakefivofovete.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f5ea11cb1---40650081686.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/78050972874.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/38c85869ffdc1708b0cdec57adaed8bb/89837336207.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b85c80dac9b---3931975315.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/68895708240.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/nekonuzo.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/gagonapulufivimunewuzewu.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210825200632_1882398584.pdfIn PDF document text
    • http://tai-group.com/upload/files/89981602813.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/26523432650.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/sefisijakopadaf.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/2339965428.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_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 19652 bytes
SHA-256: 35430f99faa9f6f00bad475f6489249a23c31470fd8b6d61f5e28bcdf37c5c81
font_01_sfnt_off00010f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1B 10404 bytes
SHA-256: ec2e5c6c0829fd9eface659b3665ed0a0f7d74a35633735e3d54305974996a7b
font_02_sfnt_off000126c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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