Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fec00b7f6288c83…

MALICIOUS

PDF

89.4 KB Created: 2021-09-04 20:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40c8a8ae921a56b2e89c91f51736fd0d SHA-1: 212acaa809816605f1dde5bad88408afad616e74 SHA-256: 5fec00b7f6288c83383613cf29ae0e1beeb08ee06e05d50072558a8e43a6951a
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to compromised WordPress upload storage and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=pstet+1+syllabus+pdf PDF link annotation
    • http://fotossc.pl/_files/file/mefupovofametigo.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/54500c50d743eac83917c8814d8d52db/xupomonupeg.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/73068062196.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f0a56aa34d---9710616769.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110fa5bea7bd---wopipedalitetufepaf.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/sibipiwubabiliwiki.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/39242250504.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a89abd28d2c---rinitiwumekibeluwepakerus.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/64922584377.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076be8bade1b---nifem.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/095da5211c86fa20dd831054cbcf6831/zosiz.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9r8dn7i8cl2iabsusokq9je4gr/23274622072.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/fifajopoderejavufamu.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c953fa60fe---sedasafitunuboselepoda.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/vurekabu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985b59196b5---67731080731.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/rh9b33b43eu5ck18rifakdr227/pipej.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/400e0f1b9e3b512dffbe33d049f04390/wimubafodazomejupagil.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/30676394158.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f65f5bcba90---mefajepesixu.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/fadadel.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/vuperitizubitega.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c9efe95bb50133daf8562f416fe813ba/51026995745.pdfIn PDF document text
    • http://effekt-film.de/files/file/fikixajijopimogoxexotovug.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_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 19240 bytes
SHA-256: 04bd2991b37bd6afb67cb402791c907fa15c0d62b9fcdfcd6c405dc543382eae
font_01_sfnt_off00012869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14080 10480 bytes
SHA-256: e1e7b7aa06e2a7dc1022122961b4f784f0013595fe1d0ffcdcd98a0855c8c7e6