Malicious PDF — malware analysis report

Static analysis result for SHA-256 32873f9913116f3e…

MALICIOUS

PDF

87.3 KB Created: 2021-09-07 22:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: de1f6e0d42576b6cc06f970a17ce6133 SHA-1: 730c1f3a821be59cc16b4227140b7b5dbb392e3c SHA-256: 32873f9913116f3e53be22362cb579f4d698ad8ab55c5857ba74a97a38373110
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple domains, including compromised WordPress sites, suggesting an attempt to distribute further payloads or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://5uempat.com/contents//files/dipevozonedujurojili.pdf In PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/98s2unukssjthc4e0hqbq7juc6/minekabesev.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/wimod.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/71920304067.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/82588889654.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/805c389d0aa50b93dd4e2eacf2eff56a/jutobekevidad.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fcc78458b---52739288988.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/309101818.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/06bd8bd9fa8bdca528da00c2b7332d35/fofujuxemerok.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/nazirisezuzol.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/negusofafavire.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/thm4bmn5s4irfsvkdkjodsfck1/50825843502.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/f02fd71f920d4656420d8f40e7e16f2c/woxewarigisetezoxanolepe.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/67600162186.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d3336baf2e9---58606923507.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/52666273944.pdfIn PDF document text
    • http://unsersohn.ch/images/file/88234002728.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/12776581866.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/57990500003.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/3367192277.pdfIn PDF document text
    • https://kaimano.it/file/26766338976.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2ee009ea058a37a63c27834acd65fe2e/dozavutotefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=acl+injuries+in+soccer+pdfPDF 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_off0000eec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 10564 bytes
SHA-256: 583b8f7fb19d9a60d55c4e3d891ae3c2943531003583604348a618c4936ee84b
font_01_sfnt_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 18624 bytes
SHA-256: 61004d2ee5734322e64460f3cd5851bf991cd9ee26e931624d9893b9a7ad0501
font_02_sfnt_off00013784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1