Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e26e749d1e26f3…

MALICIOUS

PDF

85.2 KB Created: 2021-09-07 05:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c44f6c01497585b300152d6e8155b709 SHA-1: d225b4ef1ca6834642b17368bf4fd171e18d63b6 SHA-256: 10e26e749d1e26f347c1d85d3f716838fcdc98c37d9604ad2de0f17d92fb367b
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bettynblue.com/upload/fck_img/20210625/file/zosuzozonolagukujijafol.pdf In PDF document text
    • https://digireg.nz/upload/monenejojixijumakibaxat.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/48324598277.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/b678dd00ae54bb022794006526b2df4a/kotemolivazin.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed4ed60dd8---ginowopokenudikixedo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8268fef9---56951370592.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/8589089062.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/33372619242.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/41550995163.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6fc0e17dbe08cf64c122ad9dd6feffcc/82656377459.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/pejejufusigesilit.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/pmfelqokb31l80qvi0rbjbpmg5/81885349406.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b8d6232a7---49614755273.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/97979603705.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/48966739920.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/vomapinegilixasorixo.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/nabibajuvunafufotijel.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/bejigizamowelini.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a0a0446f3ecbfe59cc4bbd6175b9bfcf/35299849998.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021081807331284.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d18542713bc---44080277.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/xigajafojimazuza.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/91981851574.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5f7a314bd---digosoxidezupuveluf.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/69977365089.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/23654311146.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/mumuxegededakujidurategus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=class+10+physical+science+book+pdf+downloadPDF 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_off0000e2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 19116 bytes
SHA-256: 49221dea45a3d51e981cd53c11c5378e806a864c815fb774015d4e9107e5fb68
font_01_sfnt_off00011493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11493 11156 bytes
SHA-256: bd9f0565512f15ba6f560be9a5a4ad87260ff2cc7ec613efe1f88bad102cbe78
font_02_sfnt_off00012e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1