Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4954bdba170586…

MALICIOUS

PDF

77.1 KB Created: 2021-07-16 03:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8e2684d9091eed0ba492232f0a03734 SHA-1: e96f3a93fbc0935633ce5438cf4339dbcf43e221 SHA-256: bd4954bdba17058679698966c82c56b7ba58c94af62ad7b3827efaa43afa12ee
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicated maliciousness. The presence of a link farm suggests an attempt to manipulate search engine results or to redirect users to malicious sites, aligning with a phishing or SEO spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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://donauwell.at/userfiles/file/kezuvakeziwimegugux.pdf In PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb1451fe02---kopotoxikapuzor.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/gesofetasalike.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/dipigatadorimebifiguz.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d12ef2b9---74142000896.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/81575249671.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19b98af35a---83518539371.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/nogutojejobuneluv.pdfIn PDF document text
    • http://henca.com/files/details/file/47569676478.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/waxegokawi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/10b7802aa8114c96c558c7dcc6a6551e/jipugefisuliledi.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/5463095536.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/41af968a5117a16d050aaad4566f1f93/17763518674.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a449b7a4c47---87601134889.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/mhetlsn0io2qo2dd586nar5t2m/masaridef.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f282a81335---mibuj.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/89174401985.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609473c620f19---85269336562.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/2236554628.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a82dcbe55---vewapare.pdfIn PDF document text
    • http://dzbnf.com/upload/file///sadikabitusimuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=comprehension+for+grade+1+with+questionsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f50fd23704---16402732161.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_off0000c99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 11312 bytes
SHA-256: 2083a5b6b90877d2eec0118414f79e96dde972a7e2cf84fbdf692a564727c84b
font_02_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 16112 bytes
SHA-256: 1e6c3aab0d366c99865a9f148475ca51961ba2cdb7d3eafe064e76d44475a6b6

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