Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c48e5e998b847a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 16:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d8119b89ea5ccaad5b0a2452d1370c1 SHA-1: bc127b73dc64c039202381b816ab2d83c05f32d6 SHA-256: d4c48e5e998b847adff66679eb29243bfc9f1401e7e44aebe0d4460a9c131fe6
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of the 'utm_term=robux+gift+code+redeem' parameter in one URL indicates a potential lure for scamming users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://eclearusa.com/images/file/wefesemekuxa.pdf In PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613358110af59---zavobuwil.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8f87d2b2c6e2f2e26118f1c03031ca7f/pobozarugitaneli.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/devosanegatokobopizagif.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/vavidikezobabuxu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132d579a1246---20360030654.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/16364994616.pdfIn PDF document text
    • http://steinemann-ag.ru/16522316599.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/vitasowoxikixuposupoki.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/28787889821.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/lukelizogufubawulotel.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ece4487eeed5ca94c74eebce602c6fa0/loragala.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/10800645109.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/58151334668.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/rabegutafixilewisaxasene.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/gefupavedenoza.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/9777231489.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/88310064940.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f34f1c0a3a---nuwibovekutonejeburiv.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/28846141873.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/legibabovur.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdf9d79a62---73667437048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=robux+gift+code+redeemPDF 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_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 10728 bytes
SHA-256: 870b69c6c9241092276adae7251a82dfecd5fd21d5fe87c59fcf4ce2503809ea
font_02_sfnt_off00010bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 19920 bytes
SHA-256: 067c559b63eb91fe87755547a5207818c91329e69a1711e227eb310e91d96443