Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92f6c8a2218213b…

MALICIOUS

PDF

88.2 KB Created: 2021-07-07 06:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a73c2b0dd9e4af51b92353947485d8d3 SHA-1: b175ca203f2c954f1e1a20f3ecd87e873f64d3ba SHA-256: f92f6c8a2218213b6b4ad72a04db17853f8d76f14773a96982136d6ad96fd068
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a894bc0855f---5152251405.pdf In PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/jozawuketowujaka.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf13eba11ad---90514658791.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27c2c4b793---59353980705.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/xirizugemubored.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/pejopamalugevume.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/42394109021.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e43527a66---rolodijakex.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080274264e85---24284659005.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/a76aac1eed061c7ee7727e69613f2d16/kosupov.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s8prgf9oq98fojaj8es43fp7v2/92829807879.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/13499978305.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/xalovavowaxederukozetopeb.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075858197514---moges.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/9dd8fe947e3a7a2ab8dae4634617ac96/vegopivewimuwuvaxu.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/991b943f91539591851db202f7b9816c/joxomogowakuvitodope.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f582660bb---tupiwodorazovorumezulu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/7e3fc5ff1f491d9d5649d969d996044e/pezedunifima.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/8aeb488f6c569811c29e96aed9359341/92276584061.pdfIn PDF document text
    • https://comiconfezioni.it/file/18053485681.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/c9b499nm0frg34hmkol79ki558813tgt/41702151439.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607866ce60bf0---pomuveje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=birth+control+for+5+yearsPDF 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_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 10732 bytes
SHA-256: ed9f5aa4f6924ce2682d38d99e1d58b63dd543a5b48bf78b4fdfb3b8ae47c5c4
font_01_sfnt_off00010b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 18652 bytes
SHA-256: 7ec321d3ccb0ddc4cdad1a321ddc85167a204ea106e49ef08a99b011725edece
font_02_sfnt_off00013bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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