Malicious PDF — malware analysis report

Static analysis result for SHA-256 711ecfb0af929650…

MALICIOUS

PDF

76.0 KB Created: 2021-09-13 23:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ffc147b1923f1315204c1beba031776 SHA-1: 6c0adf7f92da3fd552edcdaff4b175594f1192be SHA-256: 711ecfb0af929650b7b80f78d5b2c5172f4b5cb43d4d209e1b8934bfe14b8364
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wastran.ru/uplcv?utm_term=gta+vice+city+v1+07+apk PDF link annotation
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/4549401527.pdfIn PDF document text
    • http://sieuthibds.net/images/files/48230705584.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ibsa3dmkb4mthqc3khlm8nk0jk/lokuxeruxawunexetak.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613031f63b494---kofutemekusepomavojidag.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109012130051461.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/80200191444.pdfIn PDF document text
    • http://kezmosas.hu/files/file/nojonimeveg.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/15393837525.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/gesonewulitarul.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/32372062199.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/falewubemirebedokunadati.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d7677925d3641b50c8c29d83a2f04acc/28451717952.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/xozijutegapesulogulab.pdfIn PDF document text
    • http://rcot.by/pics/files/33675909705.pdfIn PDF document text
    • https://ntc-container.com/upload/files/86310564477.pdfIn PDF document text
    • http://maksimetall.ru/files/30464845531.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/nesulidogogobovutakuzeso.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/53469933815.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/98275636036.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210911191027066.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/31801588729.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/11031800925.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd9cbe5c0---gosabanunekugiwaseditaful.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/14310111575.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_off0000c6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D9 17144 bytes
SHA-256: c39bc1d7b24bb495b97aa5a51c5861232019095dfb68f003be30e4ee4845ba3f
font_01_sfnt_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B24 10364 bytes
SHA-256: edceecf45392ad2fcfd2c1a1f31d65d4f51101b1205135350bfed975115f84b1