Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8930577f4123b0…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 21:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 600c1ee3ad92f5985673a4673e2214c5 SHA-1: 7c2d723c654b288d465b163128d005ad30c4788e SHA-256: 6d8930577f4123b045845c1b845f80e9e4b8b6ab39c3ad10beca9c29e02a9b4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious content. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to download further malicious content, likely a phishing page or a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://flyingfish-stay.com/userfiles/file/vimukogutuzekatuxum.pdf In PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/23580265244.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/fosigiwadunabevor.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/xukisoruxasabejifotavi.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cf6597548---16599983489.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/momit.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a422a762582---kiwefuwobok.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5c61ec83ad90feccc937e77ac47daf4d/ropenavonasa.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/62411156500.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/gopowafogotif.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/987e90b25019d6c23f56ace93632558f/77014726243.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/zepejimipaladitupafujiluv.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3814d9ffe183dd6cd890a977b57a5394/7849412544.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/8lh4euvbtdbll8lhm7sl5odsqa/77533083896.pdfIn PDF document text
    • http://stonebreaker.at/fakinamedimifuvikewokun.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dilavevat.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/92565765518.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/59835300271.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f391fe5d0c---63182741950.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/65667632003.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/96437903768.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb12fe3712c---1903358618.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b4h073hgupkv0pcg8c1bcon2u/dajedefodurunupajilateka.pdfIn PDF document text
    • http://speckrepej.com/upload/file/zawaguziv.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/67b75b9589c2672c46383789847fa313/22255341243.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf31749d74---kaserowareduvifovepidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=caldeira+industrial+pdfPDF 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_off0000d569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD569 18980 bytes
SHA-256: aae3b56bc12864fa70f49461509a0eb51b9aa2391064756b0c4412407a728076
font_01_sfnt_off00010673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 10500 bytes
SHA-256: ad285698f541caa3b8d6ebc90f707261ff037ac680cb703001940985c2b0ad9e
font_02_sfnt_off00011e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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