Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc564bf16b4a67d…

MALICIOUS

PDF

109.3 KB Created: 2021-07-08 18:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 78818f6de437ba6ca07b3bcb66239b38 SHA-1: c372ff32234eef60450234def572df98502506ac SHA-256: ccc564bf16b4a67d4fdee024f704318aefca0ca4a3fecbbaedfb5d81a19537f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and other disposable hosting, likely to distribute further malware or phishing content. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jb1krfiaah3fbuvd33gclb2bfu/sotaputesuno.pdf In PDF document text
    • http://etre-belle.su/images/file/85362464851.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954a3c6d554---99979140360.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/tefam.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/93f9b5b5ffee99da10b345c403323cf2/50731928902.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/14024584127.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7854628fb---20322271505.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/32854122366.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/foniwowerareda.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f5c9c433---71775318856.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/mt42jkiusunau132faqol5h41c/xulotikivaw.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/39769292706.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/9irilci5qms9me56a33lif1g82/saxakoxomujunozeto.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/fad50c9a9096d0cf17c8d6c233381c5d/xirepurupidi.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/tajilepi.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5e098a417---41663582770.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc728b3275---xexigabokebo.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-10/20210510041608412820.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/3142303580.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/773050894.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/645a79744299f42b9c00e8ae91286e01/wirovewitaporowugudase.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5162b8e1---36667863675.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/29c6599c5a4280bc3e94e1e0edf28647/27233608801.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5c742b4794dd4be386f366ef9c23b7b2/41621624789.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/82900505495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=intertrochanteric+fracture+classificationPDF 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_off000148d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D6 10484 bytes
SHA-256: 12018ba822c8b6411f7946f6b41c0d277fbae804f61c57fc1eb6a413cbf87772
font_01_sfnt_off0001609a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1609A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000178ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178AC 18500 bytes
SHA-256: ca047283161615a39620056d9cfb4f6e124c0f71f42849a1da601da50fc049cf

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