Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfcbac6dd044a6c…

MALICIOUS

PDF

88.6 KB Created: 2021-09-10 15:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 425153dbfa8eb626eb3251fc19e2c7df SHA-1: 8641ee2dfc89b675781d6ce77b00b057cd23b417 SHA-256: 9bfcbac6dd044a6c3171c9886f50e8e4cc5fb17eb99afe26d26642bcb3339014
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and the link farm suggest an attempt to redirect users to malicious content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=caller+location+apk PDF link annotation
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b68b6bb63---sezadepixojarupofirefa.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/jonevopidisuxajudanor.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/vanidozoxifamuwaratitaja.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/42608714885.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/xotovojim.pdfIn PDF document text
    • https://fultoys.com/userfiles/nokoxuxowodowebejafitoro.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/firiw.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/aacd7bd676ea1bb5cdf35d3db1ccea83/73869337172.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/gobufebusolizon.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc52a03b1---wevenijipidevovojopisibe.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/texoxopijepo.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/juluju.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/14294585609.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/bifedidupusejikoginedoj.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/95599032822.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/dujojedabu.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/84718284331.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/tokifawotukaxuzogasoz.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/falobar.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/87913877805.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-2/20210902021130939386.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/mowozemiba.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/96657054696.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/6514003454.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_off0000f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F5 16888 bytes
SHA-256: 224c5a725d100d0d55a4938ce396cec1f651afe48e099e689f29ab7867dbc1fa
font_02_sfnt_off00013d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D83 10324 bytes
SHA-256: 62ba848b6a4f1950960380607030038ccc0c9d46ccd114cc481c4593f6346444

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