Malicious PDF — malware analysis report

Static analysis result for SHA-256 10aa32ed30501482…

MALICIOUS

PDF

86.1 KB Created: 2021-06-27 04:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 972c458387ac6d0401491f146d38637f SHA-1: e4cd9742e57f2fd9a11ad14376f0bed1fc500bbc SHA-256: 10aa32ed3050148210c0134d5d0f5b73615f6db095417dafb43c3ee5f7c6c54f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to obscure the final destination and potentially track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://smidgel.ru/uplcv?utm_term=can+my+dog+eat+white+chocolate PDF link annotation
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/it702t4l4u4ii0vb097s33hg7a/8865856676.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ed011e99---80355884701.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/268128b64e50f9acabb2b9001755c657/linuguga.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/gegowamawevelafiz.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/mq396ucp3530snqi6b0gh3nnfs/9240555903.pdfIn PDF document text
    • http://novichiha.ru/pic/file/zepolugejetigexugulesiko.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/rogovijapam.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d9896890a---17171350382.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/98847339873.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d529cac0ba---82205787787.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/bifujogunigivibigaxe.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/23bbbbbf786f4f24201493799b3cfe93/momabasabazarakaja.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/ludumibolefasilafite.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/83077625064.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d839490dfc---ripozojitarofi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a083fb95c77---kopul.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/21250414786.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a19bcd9cf---ludelezo.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/tenofilupuwavanisonumaw.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ma0pnc4ukdlso6pgd16716r4op/81148051887.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f039d9640a---jagefirexupu.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/roxuxomarip.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_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 16520 bytes
SHA-256: 7735ab1951f3acf886becee89dd3730e5b852e711e2a92f39a509b2915397324
font_01_sfnt_off00011a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A6 10780 bytes
SHA-256: 37d8be15ba8f3dcd50a1fdbf0c51fabdd8b93e476b1ece078fca3cb3295637d5

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