Malicious PDF — malware analysis report

Static analysis result for SHA-256 561eb30b4ce5f5fa…

MALICIOUS

PDF

81.4 KB Created: 2021-08-29 21:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 57bbf2396f3134a20d9ad184580fd455 SHA-1: 50b59935c12d0cd661db1cc83301044191ca2d6d SHA-256: 561eb30b4ce5f5fa3debe266f3c758662c58372eb9b51536fbdde7d04763b673
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=i+guess+i+miss+you+more PDF link annotation
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/41fe43ab2990f8b13a5f74a3da982c0c/71726177820.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b5bd50d29---vojewifoduwodunatew.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ed01384b1---47983975189.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/rasotowawelotadutu.pdfIn PDF document text
    • https://506hlapeta.com/files/file/danigoxilatatunipumirej.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/kj6p5gvdkqv33cj1apfs30vk65/49625600103.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/roxugar.pdfIn PDF document text
    • http://pasaru.com/upload/files/52586493274.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/94834597274.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/7868044929.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/taveruboxopelokonovir.pdfIn PDF document text
    • https://zold-kommando.hu/files/45861517280.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/23277676922.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/71303135891.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/denivuwiwafizezeneru.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sinekel.pdfIn PDF document text
    • http://veivel.com/userfiles/file/kawikinixodapewafuk.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/196d4212b39f698c95e9d2f48023cf21/91642074495.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/sloblnii1nqdushi8quarlqiak/sajaweromudemexig.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/roxogotesosazopigibok.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/1106194838.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/bibewilirepafowekig.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/degazofupejodanuna.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/jokul.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/xutirixubotekaf.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_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 10208 bytes
SHA-256: 48b06e95632f7455b8768450b3b6d9e31ecaaf4350c27191a56da61c93e53b64
font_01_sfnt_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 18644 bytes
SHA-256: dad96f4af4acedf0a9774d2a83e5ea90a053f2aa976237c87c7c8b68ed5b79fd
font_02_sfnt_off00011ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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