Malicious PDF — malware analysis report

Static analysis result for SHA-256 397f10ad8300719e…

MALICIOUS

PDF

85.8 KB Created: 2021-08-20 05:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce062507f7492d943fcb0564a1929ced SHA-1: 0a26b944ff0bfd6ef0397c36936c61599fae5cf7 SHA-256: 397f10ad8300719e1544381dc99e0da534a23026620991288e4c46d3df46e090
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support a malicious intent. No scripts were extracted, but the presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://catamma.ru/uplcv?utm_term=can+crying+too+much+hurt+my+baby PDF link annotation
    • http://klccpa.com/userfiles/file/mamigebuvemaxun.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/v5orsf44fgb1q3116u7t1skunr/begiwajilamed.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c07ebb0a88246b1f252d837df93fd6b1/dexoxubajipotoxar.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/mimuteboxovavegumig.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/30790051139.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/42968364206.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/kiwegibuxaraviwozuzutu.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/26714702621.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/24915646149.pdfIn PDF document text
    • https://anaksemut.com/contents//files/jelifisi.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160760874ea810---kajijuzafoxukudux.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/54297168319.pdfIn PDF document text
    • http://ozari-ua.com/files/file/zilivigogepugawa.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/12642492420.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/mutilebizez.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/99241469897.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f8a48decdfb6ae897d43f29bbbcaaf7b/fefod.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf836e558---83001717870.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/17098527840.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/92719714555.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/bupaforadijuri.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f93817ce97---98721916235.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/81e7c5f5953ed16d237bff5e6b6332c0/durezozeloto.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/susadoxixopexodezelan.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/91116877428.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_off0000e9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 17548 bytes
SHA-256: 35ea8aba5cd758cac0e6cfd08457b7a9b9139969b652ffe26b053948e1eb2190
font_01_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 10716 bytes
SHA-256: 5b228e14069b286c7d0cb2abda1d04d7340161217b0972c5290b74a6cb22b912
font_02_sfnt_off00012f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1