Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bd57440c908474…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 06:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7c4ac1082ac7cb4b61378892ec5e262 SHA-1: 0bd4ee52568346c85a9c1688cede6689d094a70b SHA-256: 26bd57440c9084742e784fdbeaade2fc1243b8fb83f1b16f3230ea4df73034a1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites. The primary attack pattern appears to be directing users to potentially malicious content or phishing sites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/bbaaa951e280decb374d39bb36cb19bb/94210056765.pdf In PDF document text
    • https://dietacud.eu/upload/file/lobonedumezereziwin.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/55bb1b20669870eefa109841bf0da792/60331706630.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e4976d57ec2---20356220132.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db94980424---durugob.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5bf0291de---wesotapunoji.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608199e02f3da---rozunusolodobidi.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/86990913074.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/40392792495.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/sawijeludelujarunatabuw.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/bimomiluluzobupo.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/puwiz.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/18672855351.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e937b6c5a2---zoberapekek.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a855dae5f068536e649ebc281f2845a1/pazeniwobeporoxa.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/jojinigijuw.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/pazepawexowojevesomat.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607929e37ceb5---19131239958.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7516071ad5---jojipowuxosirimaxuvojijud.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/gabawokixesevulopun.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/52023561816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=patria+potestad+mexico+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_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 17268 bytes
SHA-256: 162125baa801c83f4e8d7d47374d929d5149d987d23aa2a65ffdbc5f6213e0b4
font_01_sfnt_off000113a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 10736 bytes
SHA-256: 4e87189d28c4914b27ba82e844cd1bd1cf4423d77370b477418f7e258b7b6183
font_02_sfnt_off00012c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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