Malicious PDF — malware analysis report

Static analysis result for SHA-256 6569d8d8e137639b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 13:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d55cf7ac536c84b3f7f47ccd995e32fc SHA-1: 24977a3b25001252c70941b2330ff456c7eeb980 SHA-256: 6569d8d8e137639b9a641d39c70705c5aaa084cf9f422f6f3f161dadc1bc64f3
156 Risk Score

Malware Insights

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

The sample is a PDF document identified by ClamAV as Pdf.Phishing.Trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://cjatkinson.com/userimages/16009801606.pdf In PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcefc427e3---dojotetuxuzowupotivifowiz.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/24541244570.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/918106ccf3b67a56d306c7a2e448a858/30874221244.pdfIn PDF document text
    • https://pmms-online.com/assets/file/jozuparafowufenoter.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/raranokekamodikuz.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ec91a43e3---68693577515.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/99721543058.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/75641513589.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/sojagerutewapita.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160867a500711f---xumanuxo.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/fiwijowulixowox.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/38618516748.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/69667468299.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/badep.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/45256261744.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/xopasizuvex.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/47300827975.pdfIn PDF document text
    • http://newmob.it/userfiles/files/motebitojivamizijes.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0459077fcf---fitalowixizuzodufigux.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928fc1892cb---20145157134.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afd853e2aae---joriwefutavewugevadudi.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/63651078361.pdfIn PDF document text
    • http://infosierra.es/images/editor/nujazafekesafag.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/kazarilugurekepowafewewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=english+verb+tenses+list+pdfPDF 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_off0000daa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA0 19912 bytes
SHA-256: 0909f630560963cf3b96b33dbc4181946de15f8a4fd4d7c6780d2656e88dc6b0
font_01_sfnt_off00010d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D97 10684 bytes
SHA-256: e451369f988e51fe446b83604d06f92c051989972fa97d460c31ba628b002b18
font_02_sfnt_off00012587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1