Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77d82db66ae5ffe…

MALICIOUS

PDF

73.2 KB Created: 2021-09-13 07:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 64d11e4c6d73bdbde24696cc047d0bc6 SHA-1: 267655d2dab59205c8e3b61b530696fb1a4c3d01 SHA-256: e77d82db66ae5ffe83286c6fcc52a9d691ccaa18da887e740582fc0c29074766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious PDF files. The presence of these links suggests an attempt to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=doga+comics+free+download PDF link annotation
    • https://toananhmedical.com/uploads/files/45376212873.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/pezegifedowafogoma.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbbbc51cd---99592961790.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/17167618500.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb0cfb8c31---bapapebiwogaridajuburixar.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/ec034d09ae066d4598d938430172941a/28102668553.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/66305031809.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/vofedojexiviguzo.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/30946325170.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/5264864264.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613422bb4c6f3---suvavilorebileza.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/7983865447.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/sarovudemupof.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/kamevuderowinatevisuwup.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/sives.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/niviwixi.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/69634454136.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/52414899521.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109121812326138.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/vibegojeboninagi.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/66494570078.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/panugus.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/36581385471.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_off0000b7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D7 10808 bytes
SHA-256: edefb2851422a92e588486ce30c8e6656a936b930d847240f96f1dda88f4010c
font_01_sfnt_off0000d091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 18180 bytes
SHA-256: 3bb0a5e816acd205c080d4076b3e71191c83194d59fc107c8fb4c9a48bc66cfc