Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56bc7d9b85d178a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 06:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6c265abbf5a8e0758379dc76f463ec9 SHA-1: 1376afcd5d1a54ee219e6b824f4125e69df4493c SHA-256: f56bc7d9b85d178acf41ce04792283ec7e9259b1e23a68d733d98b28c8b1ba46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://litho-and-co.fr/ckeditor/upload/files/92121384422.pdf In PDF document text
    • http://abwninemile.com/uploads/files/50860194911.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161379abb85b1e---vafezulidexututos.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/10245255384.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/wazuxisin.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/50312340296.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/12289664608.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/duzixupabuvadutatavazekod.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0196d5dc7---fasaxewedupavabunuvukoroz.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/vinurizalogakisuweduvokar.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/fikagomurinuvunafese.pdfIn PDF document text
    • http://state-lithium.com/upload/files/8429143604.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/99175337366.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/86493364447.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/maremarorupigaruloruje.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/85370195145.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/xelokojulaxosa.pdfIn PDF document text
    • https://mmtours.si/uploads/kimakujejokuz.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c507c17f7ef47c3f2b035a9c99473e5d/mafixu.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/26186154984.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/varigorobaralinu.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/83781838719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=love+nikki+apk+hackPDF 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_off0000d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 10172 bytes
SHA-256: 21ead181f7fe4b24313bba8802afdbbdaea4cf21b7f08518cb5ed08219e07ef3
font_01_sfnt_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 19348 bytes
SHA-256: 182affd0eb6c4685d149061f33b51093c9bd32ca7b5611a5a5edf24b34273fcd

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