Malicious PDF — malware analysis report

Static analysis result for SHA-256 592d83b13ab5f12a…

MALICIOUS

PDF

90.5 KB Created: 2021-07-30 22:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 09f142787774f2f1733194faa23788d2 SHA-1: 75b112b11313ad27b74e4c610b7779b5a63a2649 SHA-256: 592d83b13ab5f12af12ce98928d5dffa15c1884f4907aacafb276d0f77592abf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90fc4667de---40154490356.pdf In PDF document text
    • http://yule-sign.com/upload/editor/file/20210730084612.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609a203736b22---tududi.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2586a8396---jimesujobugikawu.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16088800cc883d---54996535114.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/71984240114.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdcb0041b7---zidamerulimi.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2567373475---67318465516.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/8722264225.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/41b85b1023ead249bc2157913da6f486/lunovuzejekamodivu.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/5884267662.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f314b6b819---jebovugegutinovenoge.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/gegazujatiw.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gij705v25cnnv6f7go88tot0k2/39475889861.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/debawemapafinolimejejegem.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/e484a879e81ef9912d9726340a6a5613/29936451762.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/40285103085.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/xubegijogudazajezekab.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/40160617607.pdfIn PDF document text
    • https://papiratisk.cz/soubory/witekikuro.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ii3dfc3psbsnkpr4o0imsuna31/46978624084.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/batutenowuvemexodajezaj.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/767d96b8d9f21c3a48abe2fa55c7ac7a/xezejobu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701023c6b00---zisotug.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/xirakitufujenikasov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=azar+app+hack+mod+apkPDF 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_off0000fe26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11638 17464 bytes
SHA-256: fcf1da00e0134f0e219d7fa1fc285658dd4b5a81b2309aa1e88a5e69f48866e9
font_02_sfnt_off00014402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14402 10272 bytes
SHA-256: 43270eabf58b7964b6cb3086c909cadab958fe000265cb65dfb058b33bdaa3d8