Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4afcc93fc80a82…

MALICIOUS

PDF

180.8 KB Created: 2021-08-07 21:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2186b469a099b8b5f5a251ef0d6fd41 SHA-1: 23e673120dbe95b95236a7bc8084aaefbacb45ab SHA-256: cc4afcc93fc80a8238953538edb1bad1b8f7399c4f28530aa915ee4965c9a6ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/23979552041.pdf In PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/49235663331.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/sivugebemijida.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771cf56733b---21962371525.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d78292a26e---tefuvasa.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b033a47904c---14958207328.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/xugepoxomoxokimivit.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/6481326457.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/komalogexeku.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fce17eda1---52364255705.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/84025411900.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6e0b55d6a---ledibezo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a6cc8df3---jojefejag.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/18587141180.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b227a4f296---moxego.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/ea061ce18a8d82f59d4c9795af643542/nikaguligovabizafuwewox.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/48830365950.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/58612253955.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a3c7ae613---mejivuwalozuv.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/tj839ns2foal79or696qt94sh5/mirume.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/15828459091.pdfIn PDF document text
    • http://minniemleefamilyreunion.com/clients/4/46/4626b253669c69ed517e077132fb6553/File/sosez.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/7e0589c0d5693778c715793045f73624/lawusexelarupifivugatol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+are+the+similarities+between+meiosis+and+mitosisPDF 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_off0002625b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2625B 19284 bytes
SHA-256: 581e8823dbd17e7ca1f03882c4debc5836afc4f137190209fcb592546e1215d1
font_01_sfnt_off00029391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002aba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ABA8 10732 bytes
SHA-256: 8cd175bc4fed8b0cd507b1f96ae8725f2d04876d3d85492e73fd2e5ab067fcc3

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