Malicious PDF — malware analysis report

Static analysis result for SHA-256 052aebadfee09680…

MALICIOUS

PDF

73.4 KB Created: 2021-09-05 12:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 023892512aff80e8e9145d5062356e5d SHA-1: 560f6106ea72ae5f1eb6480af60cb7128a532414 SHA-256: 052aebadfee096806fb41df39bf8af43f1d7cdf594d7095b5f3142e462e0b98c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/fe8eb91202380e6c34e005f4f6c63e02/vujudolorejukinariluta.pdf In PDF document text
    • http://belgium-ex.com/images/blog//file/gozomipimubalajajare.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6a499eb52e82c91916b2d8b5704413b1/forivibekigesewusetevip.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c586af53d---rudiziroxo.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/67396074239.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/42546200964.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6483a5fbf---98978404315.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/zuzuvisutasenejobik.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/81073553247.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/mekisopidesazowesupuni.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/12685293108.pdfIn PDF document text
    • http://promador.pl/userfiles/file/keritirizu.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/17195374705.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16082c45610606---zudejesagisonerig.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/gabazalevaperexinis.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/24941294327.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/gifusafejox.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/86929076048.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/vugofezisi.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/loromowopomi.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/24241931346.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d4b71a937---74762789169.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/kujurugebuxele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=organic+synthesis+by+jagdamba+singh+pdfPDF 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_off0000ba12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA12 11312 bytes
SHA-256: 13eff4ffb4c01b31938fcfa5d6f8034b4ef782ab5aa8f6c0658c90cd7a3296af
font_01_sfnt_off0000d41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 16964 bytes
SHA-256: 7352705281f4c16de167d0c18f20b4f0fb9a95538b64f03f5f2c5b7d42ed1763

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