Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7256fa3d44aa49…

MALICIOUS

PDF

89.9 KB Created: 2021-06-25 22:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c38c7affe18508619a55b2d24cd22c9e SHA-1: aeef9bb8c6a32205dc16bc7185e40eff999b6e13 SHA-256: 6d7256fa3d44aa49f814f71f817f9c52a0bc3d083ced2e3fb77a516b76f4c356
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://synerhu.ru/uplcv?utm_term=stop+jim+crow+two
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b807c9e8ea2---tesixirolatakoxed.pdf
    • https://siam-royal-view.ru/data/files/rusav.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa43a1c375---49784886617.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8c7b4dea2---mafuxuwovux.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b14de45141b05fa291532062389a9aa7/dinububejatet.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/mafatisadosizoke.pdf
    • https://aldurra.ly/images-editeur/img/file/40022698262.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c004355cb---58660274961.pdf
    • https://autosaloncenter.com/uploads/file/62805975258.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608873e72fc24---98630711742.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r9g05nlj4020qvsp6ftludeip1/49693970154.pdf
    • https://bouwservicewinthagen.nl/userfiles/image/file/79229686895.pdf
    • http://cokhibaosang.com/media/ftp/file/78243508639.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607202d579880---kewosute.pdf
    • https://liniagdanskzydowo.pl/files/welexabutatuxixawuvawu.pdf
    • http://ouhkpthaa.org/userfiles/78999246339.pdf
    • https://vestol.bg/files/file/xatapusazike.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb448617026---duwavedup.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c14db2e46ae---30029075489.pdf
    • http://www.buildingmalawi.com/images/uploaded/documents/31762876532.pdf
    • https://n-zvuk.ru/upload/file/61941897395.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/bdkfr9dlcn2fkf411q6j7mamj1/34141198504.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160813cf445fa4---62775609926.pdf
    • http://reelproductionshd.com/userfiles/file/fujowisijota.pdf
    • http://sincaremedicaltour.com/js/upload/21980801502.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fea5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 16792 bytes
font_01_sfnt_off000116b7.bin
82463e3b0ff22c4c7e3df6e5aad4c0340f5295a2bc4e923e8001574149764f89
pdf-font-stream PDF embedded font (sfnt) at offset 0x116B7 17288 bytes
font_02_sfnt_off00014396.bin
52f8ad8df2885ae8b640f8ff889c6166f540671a96446748e02c4bbe170501a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x14396 10216 bytes