Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e8881438645484…

MALICIOUS

PDF

89.3 KB Created: 2021-08-08 15:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ed199de91e8e42bdf2798949a5a3566 SHA-1: 9d44f923b39aed2bdb248da6a497ec4365a8ff03 SHA-256: 95e8881438645484844041c58c9575f59629e5ee8c68dfa6e8467bdd068ae455
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The PDF structure itself is also flagged for containing duplicate object bodies, which can be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c02289d863eb2d12356aa69077fdeab7/26529660101.pdf In PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/61715692879.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/pewesafipif.pdfIn PDF document text
    • https://seikico.net/img-tym/files/bumonodipidowapekosezabud.pdfIn PDF document text
    • http://www.shadowrangers.live/img/files/86385940987.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/84841021811.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b166097ff8d---19746500781.pdfIn PDF document text
    • http://sbairs.com/datas/files/42247349266.pdfIn PDF document text
    • https://thepainter.asia/upload/files/26159324803.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f99801ce74e---turuzewirusus.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/88123574238.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/db8792448dc3c04fe2933561798f03bb/vedowigerivafogobik.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1509096c6---woxonumefopulenofeneg.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/sisoviwudoxatilopifivi.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/51688620768.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/13174793270.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/07/21/50220179862.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afceae0f947---75589440495.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210706073125_t6uho3.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609300dceb65c---79864172856.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/998d4571dce801e7abf2be594357bde7/36867860671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+change+my+keurig+2.0+water+filterPDF 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_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 17212 bytes
SHA-256: e1216583c13f62514a753cc5ee497c7210c88091418a9615bd0a08ecdbd05c85
font_01_sfnt_off000122dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF3 11304 bytes
SHA-256: f00fb214788a66b366c85fec9585c664827b91056d9e2be5cd79b705242a8815

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