Malicious PDF — malware analysis report

Static analysis result for SHA-256 061a8b03e283ed5c…

MALICIOUS

PDF

91.8 KB Created: 2021-09-13 15:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de00c9fb7b08521af183a85544d113de SHA-1: 8a9e0dbe62c1960c9440f764e532f32e27f8af0b SHA-256: 061a8b03e283ed5c2224286769bbb8cfa904a5aab44003f77d6c1e73501dacab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9672

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://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/45ccabf8d4e5a6853470f1c0cb7974fc/22947163224.pdf In PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/5fdfab8a93747c90cbcfacbcc995bff5/99796429604.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/28409969453.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/fogatezini.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/kosujudux.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/gidaxuzuzaxofinotovinalal.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109130621563188.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/repadurofupuxuzezo.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/70516492933.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/datugogolakata.pdfIn PDF document text
    • https://limsurdua.com/contents/files/5019616258.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/xotovoxuberejefisuved.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/30033643808.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/fizurikekotokakidofivowil.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/57398201741.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/5beeb55cf3e8716301fd4d1a573beeea/82689362632.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/68901961570.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d616ba2388---4755199216.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/91118227095.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/fofazukumuriviwudo.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/89213989051.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/81579510255.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/46209574299.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a286d222d---56416838028.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/zigefojinewovenodefamu.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/6936231304.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/jimuni.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210906_124743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=vidmate+app+latest+version+2021PDF 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://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_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 10880 bytes
SHA-256: 2a2ece249f1ab7f9276e23c80d24392b826c10c597497f9d539f46dd848fb1d7
font_01_sfnt_off00011e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0C 18628 bytes
SHA-256: de5e941ce887a8aceae41f7ff2c6aff8cc152670b85ee1f9e20b167074744d2d
font_02_sfnt_off00014e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1