Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f106e8945d647b2…

MALICIOUS

PDF

75.1 KB Created: 2021-09-01 22:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f291b1d8f9ce7b175e188b90499034b9 SHA-1: 7b3748ba7d6816181c166e7f8f219b06327bb22e SHA-256: 5f106e8945d647b2e1ed06558f4d137a42aa5cc551fcd8edac6b1b206f0f6844
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59db4048d0---7437053259.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/kun2uejvhh9s2i94v9cc00jn31/270318469.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/vofinunutomopowonud.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/xakiga.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e9350ab8a---71947628952.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8fba1a23b67e0f4873557f3e94365d99/senusiwuxilovum.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/npsaco11hv955bmfh24u6p9p64/xonukenabutut.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/71452868121.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbc3fae18e---20326833437.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4402271f3d---sapunesedigelid.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a10a2777b2c3b876e8836cf65223ae47/movexagesezuronoripe.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/879885400d393e13aae865a04a8908b3/58443914069.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/baxinekelaxatog.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/27024029778.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210702093830.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/fipufime.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/20684497422.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161151b746dc6c---sabarevulireridovide.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/pejufus.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/99480399560.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/kojurizolagadibazekadab.pdfIn PDF document text
    • http://pk.mo/userfiles/file/wimufoxanubijaxe.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/9690968147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hungry+shark+download+modPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/440303b3d1c05639c1342c8764f83375/61886277513.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_off0000c23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23F 16640 bytes
SHA-256: cd697a127b42cd8e49c3e7f071207ddc160272aa90b0e7ef22acac7cc622764c
font_01_sfnt_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 10756 bytes
SHA-256: 5835592e09d113276bda6df0e374aa6a0f1178bef5eae2d02c1086becc04bf73

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