Malicious PDF — malware analysis report

Static analysis result for SHA-256 4096cb0d49bcfe92…

MALICIOUS

PDF

79.9 KB Created: 2021-08-07 23:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b4e87469e1e5f8e6b452d812294eba4f SHA-1: 346b0ba5deb9cd2c9f4e9d74833912557ac0c77a SHA-256: 4096cb0d49bcfe925f535e7e1fb74e1f0f7d3ab705f654ea16480d68bfeb1e5a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting it's designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://seasonsblinds.com/uploads/ckfinder/userfiles/files/68839326503.pdf In PDF document text
    • https://kanat.com/upload/ckfinder/files/dosovifukufap.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/e0204e24c5f34c4bc10f003a12b96a56/kumanavefabom.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/48975681816.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/fokureri.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/2576771537.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/rikitosemuvejakes.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/zazunipezanugivepe.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/torefaf.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/90772215421.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2a551ba35---vuwevubazuxaxiparajoderub.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f8977f98e---79643662344.pdfIn PDF document text
    • http://bettekingproductions.com/clients/874300/File/17758432075.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e4703b071a3d776519c2a468f1e38154/bukeresejopoderigixefis.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/bewozofotetepujabidabe.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/zigowujokikemidi.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160897fc83a33e---fugiwekunimixuval.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f458586a7a---85348396140.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/danopixitonag.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/43dc601e0bd63be25241fd92731defa0/leruruwodurinagozowon.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/waxuvujuzodisen.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/1ffdc0913657e7e9c90c13a6d6491e47/ruzegevaxudapasigopibitu.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/wojojinufalur.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160739c4e96d02---duxuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pocket+guide+to+public+speaking+4th+edition+pdfPDF 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_off0000d287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD287 17104 bytes
SHA-256: 89e4af911656875fd192a64c8611154dc2c69d3a08099162792e602b2c553122
font_01_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11751 11208 bytes
SHA-256: 8d53d4ac10bc4a0e67087de54953b35f28fb8e42cee5b2b2c71eb48bd06081ba