Malicious PDF — malware analysis report

Static analysis result for SHA-256 85de7d2ccf7bfffa…

MALICIOUS

PDF

82.3 KB Created: 2021-07-07 09:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6dfc7bf185cd5c25242ae2b2bfae235e SHA-1: 4d471a7afa538a38ccfd8b357c5c7096429ff6bc SHA-256: 85de7d2ccf7bfffa96e46c53fbbba5f2029fd187b0fff8e1ec35f966359326fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it is designed to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://feniks9.ru/ckfinder/userfiles/files/kolujexa.pdf In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4a6f3c0260350266c5c3630106a4bcc8/bufawopokabelararola.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/40128452258.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/84042286092.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3fc850c9c---87422958612.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/xovomevewojarawasasumun.pdfIn PDF document text
    • http://cy2hand.com/userfiles/poraxuw.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6f1f9cdb9a47b5697c21297eb6af32d/gimirawibufonaga.pdfIn PDF document text
    • http://446888.top/userfiles/file/59093699333.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k6b8osublvu1ednq900saqmo85/10196097111.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6bejssuncol9vt74j3ddkecro6/putotagikuvonusije.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/g9mjagn6kbj7evv7pfigijp106/boboju.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e26d50bfb24---fefatuvalidanaxeji.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/somokedabizofexo.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf24888351b3884bbc963855aa8aa359/josatom.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b453009fd9f---27920013136.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bobunepaponevutuwozisitum.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/gijoso.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847748bfe9b---lanalamuf.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaa47886ef---72165051227.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/19756690828.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/13839490634.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608367cbc95ee---49915478873.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe09d67188---89369892844.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/7k3vuotlub3bua6t1kvo6iqunm/gunuketetoza.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/492c39j4loa0r6k66ibnjvdm66/xefog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=drivers+license+greenville+msPDF 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_off0000e293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 10260 bytes
SHA-256: 1d630ba24bacdbf55ec1a7ed9ba207a4aa243378b53e5c29df63d9f73e3ee287
font_02_sfnt_off000111b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 16312 bytes
SHA-256: 3822e60150c6467355b97576c73bacfd34a30abf4d1ea9b90f075a1a6b3afe7e

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