Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d89dba6e6b14a9…

MALICIOUS

PDF

70.1 KB Created: 2021-09-30 19:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 78b2a9972976725b3af9f6ca971fa420 SHA-1: 898f97c3f9653b155acbb0a1c8cee6c38bcbc859 SHA-256: 64d89dba6e6b14a9c3b017ee4cb8910d5cbf37d1a77e4a5b44a299163285c967
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs embedded within its structure. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan. The embedded URLs, such as 'https://pixomot.ru/uplcv?utm_term=how+to+make+factory+reset+android', likely serve as lures to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=how+to+make+factory+reset+android PDF link annotation
    • http://hankyunget.net/userData/board/file/gefukevewubozatobi.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/64388308300.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109141905039070.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ov8p366ubhhgccu19rfaavebi0/77537640892.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/talus.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/42845423243.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/9fcf96be6b585027a1c9310c872c80d4/vuguparuza.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/47851927054.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/8071852101.pdfIn PDF document text
    • https://eniedu.com/data/file/20210930200147.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/64691998285.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/65118230671.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/28492113937.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/sinudubozolojofutovazaj.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/raxisegikobefazitezoto.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/metefuga.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/73302692181.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021092407452335.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/25881957566.pdfIn PDF document text
    • http://klhl.com/userfiles/file/fenudujumamonogixeduvorum.pdfIn PDF document text
    • http://jar-ted.pl/file/zipurexatosoduwa.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f51f92b345---91133078404.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/6593855231.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/wisakepovabidugukapufin.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_off0000b33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4D 15100 bytes
SHA-256: d0ba52749dbafba330cc5056fb1840dec4acaf3683303ba2d5a03a77460f437a
font_02_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 10876 bytes
SHA-256: e4c43d34263171c97e29fa46bdd76cdf36bcecfb2daed4710dbe22d2b93e7277