Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a811aedf311cdd…

MALICIOUS

PDF

89.9 KB Created: 2021-09-18 06:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9a85214b3ee4b44bd0ba888d234d5760 SHA-1: 85ec86641a577bcb98c613a888fcf99479bfe735 SHA-256: e9a811aedf311cdde29fed4dce9012863ee1f0cddf379bb8feaf3f02aed96d8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress uploads and disposable hosting. Numerous URLs were extracted, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF format and the nature of the heuristics suggest potential for embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=android+11+on+a71 PDF link annotation
    • https://scavilecis.it/userfiles/file/detasagikivolenex.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/bipubinexevufejonu.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/miborukivowo.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/js70o0buds7htiqr5k3jga83ig/mimojulimab.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-03/210903100807163403yone7cyc2tnu.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/94640506266.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/vutag.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/41847598914.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/99897376374.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/21478cd6bbf591090ba5ee70075957ef/kajotodugobav.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/44379788652.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210911_185922.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/92972022271.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/fuxitagewipilagotigusoxux.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/31635104366.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/jewufexavul.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/71685423004.pdfIn PDF document text
    • http://ridendo.cz/files/file/4192820279.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/90743943575.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/28867010319.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137817de832b---78994163839.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/gapufawuxomavub.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349a555f554---gamijipidev.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109160937372415.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/jeriwudurut.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_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 21680 bytes
SHA-256: f78494545e64ac4536945eb9b75ff91496d0d797457fc37ebf3ba090cfbe6f69
font_01_sfnt_off00012c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001443f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1443F 9880 bytes
SHA-256: 5a2a205b9310b6ddc9708af28425c7bbdf3553cb6b3d97ada6968d0a39348c8b

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