Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c184dd3862eac43…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 01:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39b003d2b3318280c0e0cf50c1b979d3 SHA-1: 09ab4e8c9f04b14e494e74c95e4329623bf27eba SHA-256: 8c184dd3862eac43626050ff4627480dcea9ecb4dbc0db3621d1aff83586e1b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://krisoc.ru/uplcv?utm_term=best+music+player+for+android+tablet+free+download PDF link annotation
    • http://wanyuantemple.tw/userfiles/file/fokapegamakid.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/gowusofaza.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/7014634492.pdfIn PDF document text
    • http://fivelscope.net/fckimages/gomuterojegoxipofijog.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/wigijizowoberamosavamate.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/71460556528.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/sizifu.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/93301891865.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/jizibizewida.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afa2a9354d---gimudadoranilopetunowa.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/lamadikegeran.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/ribabepufawo.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/40971287618.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/68045440701.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/1194721896.pdfIn PDF document text
    • http://eventechsite.com/files/files/vifagunu.pdfIn PDF document text
    • https://2acontractor.it/images/file/rokejew.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/9892158404.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/tidezarujikin.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613245f224529---mojawivo.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141d4568333d---libakebalorosijovumu.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/nesevumezejex.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/90541327364.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/45399029977.pdfIn PDF document text
    • http://recrute.fr/files/files/26375004364.pdfIn PDF document text
    • https://lapdonline.org/file/44679188544.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_off0000dc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 17908 bytes
SHA-256: 69eed16b1aac52d3f1767f669e972574a4bbf1bb18b89750cf7f163324d5eff6
font_02_sfnt_off0001225d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225D 11272 bytes
SHA-256: f3c5004d16a5c048c8fd9e8ccc38af4af72ccdf6faf2fde6242985bf85d7830d

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