Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb0bc15fc1213c8…

MALICIOUS

PDF

88.2 KB Created: 2021-08-08 17:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 33402a957acbb51067e9591ef1b576ee SHA-1: 84cc2fff225acaffe09912785cb4d0309c7feb3d SHA-256: 0fb0bc15fc1213c8cc12dea724218f6f37373928c2bbb6954e5bc3a88421afa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users to malicious content, likely as a first stage in a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://talleresjpg.es/img/file/66430258595.pdf In PDF document text
    • http://coinproject.com/userfiles/image/file/juwiwago.pdfIn PDF document text
    • http://www.heksan.com.pl/file/99899747691.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d538430ba4---11618714881.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/mekeojf87vmrfkcj79n9n07jg5/76357633444.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ju4tvrhjvk7phimv2hiuqv2bpf/jumofabun.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/zijifoperu.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837a52b0717---88588429312.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/71865712352.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/tarezibememovotubijigo.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16089e32e6ccbd---28809810291.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/nuzurumagasakewazuzapeni.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5449650ef---76392548078.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/956506524e770b988800453e1fd87c0d/55623339331.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160d81684ddb56---11163519609.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e5c34babd96---46121321218.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/vipazefev.pdfIn PDF document text
    • http://xn--b3ct0dc9bc4a4g.com/userfiles/files/deduvuvipaj.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c469504fa64---susupefegago.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c21b443e8b6dee045626894833443173/81831262470.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/14644903266.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/14679936907.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/nezux.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/7cc985fbc5857b6ae21a554e16ade711/xewunibowuzanimanilef.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210629/file/16250034175587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=exercices+sur+les+propri%C3%A9t%C3%A9s+des+droites+parall%C3%A8les+et+perpendiculaires+6emePDF 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_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 19852 bytes
SHA-256: bde09c2c278346fd3a6d78e315ce8825d2436f4d68b8189b378af2afd1f9b205
font_01_sfnt_off00011cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDF 11336 bytes
SHA-256: 14571eafbb5142b7fddb1a5c1215dd3444e4dfc2300292af5497cab5a25e4363
font_02_sfnt_off000136de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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