Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02b892b69620a1e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-18 11:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6d62911ab6851b9ff497886e3cb803a SHA-1: c06bff50f23ebf676f27cec3a12d3bcd8e48f552 SHA-256: f02b892b69620a1e8f3d5434d3a85de7fe80e18fe73e7cef2970cbd56488a1ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=how+do+you+clear+predictive+text+on+android PDF link annotation
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443c4d7ace6---raxog.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd6a32b71---12302038634.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf33578035---fizajevafabosovikug.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138975cab820---59489845720.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/189d6cdc0c0c43e05947baa8e876bf87/vizud.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/25608425290.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/buguduwedadiribox.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/zegusigakazepevuwa.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/95654878696.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/38996892421.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/levavewerisuxelowajiperet.pdfIn PDF document text
    • http://art-ball.net/files/file/9184445485.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/badeberima.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/sawowas.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145623a045f7---94568548850.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/diwijedisixisafidonawada.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/zafitigakile.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/zefiguvagoxagiribezusi.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/283214054e76504b8373da705237c5ce/seluxateru.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396a79bf7c3---fonifopox.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/11752795470.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/2570479034.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_off0000bc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC07 16120 bytes
SHA-256: 5baf37017bda3806accc08ca5741929a37692623fb88fa8b640cfb375d2d6b42
font_01_sfnt_off0000e599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 10796 bytes
SHA-256: 74b2e0c581c1453783f6cbde4560338e8172cce003512d43985a4a4492bc9139
font_02_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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