Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c74a48646f4325…

MALICIOUS

PDF

87.7 KB Created: 2021-06-27 00:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2b3cf8fbd1645f8020f3e55c54dba7c SHA-1: 6ee07efa03e69b327df9a5d84cbcee0ea6061946 SHA-256: c1c74a48646f43259661b0687dc12a211a5e18dd79dd0978b8f30461b4d29370
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to websites utilizing compromised CMS upload functionalities. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the link farm heuristics and external detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://sneedfamilyct.com/clients/44919/File/58523724321.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7riknnd544eg7jd5miffe5dl98/xuvagejomar.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/44bff358d3c8cccc6a7eee3b69ee40bc/jeforilasovawa.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/abf73aa103503e61b1f8f1749cacbd0f/66993207400.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf08bcea1f1---govusatakijuwu.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac33a3886---2244432665.pdf
    • http://cdn.eagle.mn/uploads/userfiles/files/622691139.pdf
    • https://7gking.tw/upload/files/sakigizekopekozogobodizuw.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/851c812a5bba4076e8ae4052382b62db/27953106605.pdf
    • http://2ds-creations.fr/userfiles/file/nilorovizu.pdf
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/69841256246.pdf
    • http://merwepizza.com/upload/file/watutenalitomunex.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/3ddd932702ba202cab5b44fd6c3024b2/80829184416.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b8699ce8272---70577738546.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b21918d0797e970e9e5ec0af1760c580/17392707888.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/6f5d1643a7892667ad85ffcc81e87a0a/94053036401.pdf
    • http://maekalocal.com/Maeka/UserFiles/File/venomefuluwibonasiparud.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/368kdsstnp1q33esq47a4eh13m/nenizerikusedadapotogi.pdf
    • http://techsystem.gr/data/uploads/ckeditor/files/kebanuxagodurilomefodokis.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe13f44366---vovivuvunisej.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c03441b451---20853093284.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ige3h4md8imj9p4qr6se011lj1/kebuzaxid.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5638807fb9---zamupove.pdf
    • http://slsnn.ru/content/file/rogoxawimobixolu.pdf
    • http://textingrights.com/userfiles/files/vawolimemin.pdf
    • http://kibbkw.com/uploads/file/43193295851.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=reading+comprehension+passages+with+questions+for+high+school+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f19b.bin
0887a95953e62b196a3c347af054132d8aac2b243120f1bf4edb4a70ac50c665
pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 17212 bytes
font_01_sfnt_off00011e66.bin
2487a28770874b6be86f603872ca8e9d98dd577d1a4a1a625c6f9f993dd654e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 11444 bytes
font_02_sfnt_off000138be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138BE 16792 bytes