Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a56593358fef82…

MALICIOUS

PDF

93.4 KB Created: 2021-09-14 04:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eae79b25a6e609c5211ccbf7a4462a57 SHA-1: 63255b7587bd97cf0ebad628e521ab4b9fad2290 SHA-256: 10a56593358fef821aadd309362d929eef37ffb9233c2f836152dd3ae396fd7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the PDF structure strongly suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://baigiangtoanhoc.com/upload/files/dokefaxuwamugowitiniduf.pdf In PDF document text
    • http://eskuvoiiranytu.hu/blog/file/mamenadisibobosikarogagu.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/8446505929.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/kazefurufigapuvu.pdfIn PDF document text
    • https://ratodua.com/contents/files/31120505069.pdfIn PDF document text
    • http://santehnika34.ru/images/file/65383952567.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/kusanovobi.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/diginifubizojeminatuzos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613645f90262a---zujepiremakugugufosiveg.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/xesilebenafifevaza.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/71471181275.pdfIn PDF document text
    • https://solturism.ro/images/file/13783148765.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/xuzabasogizifosalawetut.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/vekepiwafofunifap.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210908200126.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd22094ca0---dipavelomewa.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/tabijefitoferilim.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/berejavid.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/74242443161.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfeab1d9df---lulapofewaz.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/71128187911.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc1d7fcec---50067984244.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/78981670104.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613743814525a---gabetunojalatewipixane.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/96930425150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=killer+bean+app+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 10336 bytes
SHA-256: c0ca069d76cb697935eef325e2774c213924a2247c66e24d3f7834b666b00523
font_01_sfnt_off0000fab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB8 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_02_sfnt_off00011016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12828 21408 bytes
SHA-256: 21ec487f7bd01f2ced16496fe93f27740e79ec656c8ffa96600a07f242722706
font_04_sfnt_off00015f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F0A 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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