Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fdb15eb6abcea2…

MALICIOUS

PDF

97.2 KB Created: 2021-09-05 12:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e1280609beab739e7c79105047ebc9ec SHA-1: 55a13e3c3c60d3c51337fd00c25dd733c87783cf SHA-256: 55fdb15eb6abcea2267a4ad67e34f09c2a55b311df673d4abfc649160deeb7e9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple links on potentially compromised infrastructure suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://sjalikave.hu/pictures/file/14503725276.pdf In PDF document text
    • http://sola-brothers.com/userfiles/file/jilegezazu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e83c05f09---maretitusesavi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/64a3ca03664de1ddd0e48257a89f89c9/23752129020.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/1597670540.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d91401a051---21280502375.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/maxirukut.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/74aaf228b73ad4925166c3caddc13b3d/dugegajigadukufede.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/7275492272ae65ea24221065d34688b1/sinatizatireminapurenasew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e29da0518a0---kebofom.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5aefacd4f797ace99f61bbbf644364a8/nijimiposozokexigubepubew.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2eb1ec52---jomerusaxujumemuvewo.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/14396570239.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/gifuf.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/448b865e8cd386906f5483cbccab6498/lapapu.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/15580612536.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/22395562635.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1bb71c5b98406857cc61c8412451cc8c/lalurivatuzifiluforogun.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/beduzina.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160da5595ef388---32175107935.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160733ff5a7013---47643043184.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/wuxidujewugadotigidena.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3d2b167e1---23088987936.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608008f958e53---mopubokegijovakukujibibi.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/vuxetenumebapabe.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/43387996223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=italo+calvino+marcovaldo+pdf+espa%C3%B1olPDF 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_off00010f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F66 11004 bytes
SHA-256: e9ec57b34f9229206f8677de10317fc3f8bbed03c7cf05cb5a13481a944bba8c
font_01_sfnt_off000128b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B3 20184 bytes
SHA-256: d86b1728e4db2d799985709ecc8222de03dd935fbba541d5b4d3d930059745e5
font_02_sfnt_off00015cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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