Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7920dd90b540c8…

MALICIOUS

PDF

73.1 KB Created: 2021-09-12 21:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 94fd3165821a4314cd09fe1fc67d2710 SHA-1: 0f99cb702785a4c9e4d2d4e766ffe67bf90a8178 SHA-256: 1a7920dd90b540c82abcb483fc493a2850a26a934b052f6424678d8ec8628a32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The file's structure and URL patterns align with common techniques for link farms used in phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://radio6deenero.com/uploaded/files/95120684896.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/eub1vbbati1uj38i5pqvqnf2b5/80806826338.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/909fcab72ccb5867c126e8140f7c4b3a/wologebowanowunifa.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/19326580319.pdfIn PDF document text
    • http://sushi-belovo.ru/files/bolilojekaji.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/nelokoxalenaxofadem.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6319797d4---3705680940.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/vixosozetosi.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/bazevuderepiba.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/tojoxokimozamesivamogotej.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/95713889579.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/88328541676.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/dumugavorunijode.pdfIn PDF document text
    • http://technocom.pl/editor/file/dowesim.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/xugid.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/48907175233.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/vivakunebelopowobet.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/76178110415.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/rimenuk.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/dapaluno.pdfIn PDF document text
    • https://eclearusa.com/images/file/xigimutokilujukikififu.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/zodevovuzigokukotiwivut.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/77620860494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bsc+nursing+1st+year+anatomy+and+physiology+notesPDF 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_off0000bb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB72 11280 bytes
SHA-256: d03b0e096d3e1dbc64160adafc921ed6d56a2092414044b7b421021e175bd759
font_01_sfnt_off0000d59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59B 16048 bytes
SHA-256: c67eb0fe13af068c11ef930d5cdcc145bfbc86713eb20e9e21e92497b5582a3a
font_02_sfnt_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1