Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd730f0d8afecf2…

MALICIOUS

PDF

93.1 KB Created: 2021-09-06 12:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db2187ae1abafbaf9f27f91d86bb5a8b SHA-1: ccba8665f32fe84f998ff3ee317192aab8e069cb SHA-256: 8dd730f0d8afecf238a671c856d6352082ddcc84d3289aa31ead5c3e531d3d90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or serving a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://argekaucuk.com/nbg/upload/files/galinemegewoxolezak.pdf In PDF document text
    • http://evaemlak.com/userfiles/file///39129455569.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/06b24ef50ebee9c365a301d2f97de2e9/gojesor.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611d3198c6ae9---bozojoxidexomodewiresaj.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59f9ac3558---desoxelixulifiruvifufu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e206314cdd---10085574299.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/22057873651.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/i90avdue27cslitd9u9rlju9v3/musimisu.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/99404129178.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f95c0d5b68---saropepatuku.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16feda2c7---ralegezadikebiba.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/soxubovitavapixademezup.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/47855286642.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab70b3473---wegunurejesixevobafowigup.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/punoxuzenivimutudef.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/tejokoxazuti.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/vemebaza.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef5b1473b---kaxawajanudigitekowuso.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/e3840ac17d8b77971f98776063d320d3/9492158210.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/nl4aei09m4jnhi88g609531da1/wozodiridimuv.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/34723209576.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/molurijavufemowenamudanog.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/botibebopo.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/zilolukixesudugogosij.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/tukmes4pcicir5mcmldo8e50j5/97804253983.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/disijuvunozijemimava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=progressive+tenses+of+verbs+worksheets+with+answersPDF 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_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 10832 bytes
SHA-256: 7447d5bbc402cb788518443b35a80f79ce8ac9e3f956c94ef99af1d7b086e8d9
font_02_sfnt_off000136ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FF 18376 bytes
SHA-256: 2771c6ba4cc0ed3a3c187123b709f6bc3844ba138177140331d55834823c1b86