Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbff308865ad4bf8…

MALICIOUS

PDF

84.8 KB Created: 2021-09-18 10:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b00c8e1ea5bce50f9e43184ff6f151b3 SHA-1: 29d839fe1334cf76634f40036abba0c1c6724a68 SHA-256: cbff308865ad4bf8ba1351fcf7378564b8d6bb3326936c0fdb98302c013c48d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to appear legitimate, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests exploitation of content management systems. ClamAV detection and ML classification confirm the malicious nature, strongly suggesting a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=double+tap+to+lock+android PDF link annotation
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/sisagak.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/kitatukarokevivabedosi.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/pawininulesideroxosu.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/sulimixixurutigizi.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/jegikuwusisaba.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/24518300370.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142506d4e408---lotekisanufinejewinujol.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/13178077133.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3abbc0c86665de5db1918e16298c1978/feruxedo.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/madasegisumazimipopinud.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/jomefumov.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/53993231277.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210916053628.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/narerusifanototexekor.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fa5cbe02e8ce8778c2e1065d4859bafc/13298178535.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/gesatavikezebavativinugog.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/53734632526.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631142981.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/10211742358.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614081691f4a5---jomedajetesatagerog.pdfIn PDF document text
    • http://biomehl.com/images/content/files/15766366657.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/43513098158.pdfIn PDF document text
    • https://maisonforville.be/documents/file/76772565865.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/13128918656.pdfIn PDF document text
    • https://chimrodistribution.ro/poze_diverse/file/16808506910.pdfIn PDF document text
    • 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_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 20184 bytes
SHA-256: c4d8b348ff103f4e0745e6ec89509a78acb7c54c809175acb219ce451e499c15
font_02_sfnt_off00012ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE9 10672 bytes
SHA-256: 5583a1c44bce9872c11ff5fc5f0aa2c3051a4f9a3a45762b2d9ef59fd44a2a7c

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