Malicious PDF — malware analysis report

Static analysis result for SHA-256 57814ecd7e57f4b5…

MALICIOUS

PDF

85.3 KB Created: 2021-06-26 06:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b154dde8f6b4766edc81f65711782f8f SHA-1: c6b4623b4d80496cf0b35bde9431e8406c69e361 SHA-256: 57814ecd7e57f4b57b1deccdf997a853e76db7f604a15291adb737b4a72b3f35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/7f8382cac111159236ba0d3b2af9efeb/dumojibezoxuluzabafuv.pdf In PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607001c7037e5---wujal.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833e0c1d3e5---78883349027.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/44569781377.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609773a251e5f---bogexawixoraxozikanewa.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/3387dd55513b0c612225074820241e5e/50697775467.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ad88017c5b409f20da02afb84fd0b1d9/73194206893.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd027cd19b0---sugabapaku.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe815b7a1d---97400066584.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f2aa65e7d827bef00906f124762013c5/6615300363.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/85992919691.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b2597df1648---kitokogal.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/rusodopatewupupijoz.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/92749773253.pdfIn PDF document text
    • http://phanbonvbm.com/upload/files/56290168815.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/wokod.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52f77de27e---54016295914.pdfIn PDF document text
    • http://www.asslar.de/downloads/vubusimuzodape.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/rovatimidewisezapepeba.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d5eead3fe9a47bad17b5395ec8ed04b7/borigupit.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aceea4c1695---mixeburoziripasotutugebe.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b3a577480---niluvagixezu.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/66988904286.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/tonuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=biomes+word+searchPDF 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_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 10528 bytes
SHA-256: 620c0247fcc56a2b931f3d08e8731edcbb2312fd83b84a5b1b42e977ac21cb20
font_01_sfnt_off00010241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 17468 bytes
SHA-256: 8e590443c876806a76af4661082c10c872eaedf91d419c5b1a5578520355e20b

Open this report in the interactive analyzer, or submit your own file for analysis.