Malicious PDF — malware analysis report

Static analysis result for SHA-256 b925678e68ffbcd7…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 18:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ca9eee81d1f05197a42523bb9c41d2b2 SHA-1: a0955f12b96fc6264265ea004928df0f3fe83e89 SHA-256: b925678e68ffbcd7af8fe622229d823395531a791aaf080d1304e56f1b773563
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ngm31hndrs9j2s396pshmk8hh0/7441011717.pdf In PDF document text
    • http://poslovniimenik.net/firme_data/files/rovifimidu.pdfIn PDF document text
    • https://network-italia.com/file/furonarinitivugexufov.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/mexajosezexej.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94b6e93ec---vofirikapidizas.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/pugosivudi.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/tuvokezifodunewuzimusir.pdfIn PDF document text
    • https://ms01bet.com/contents/files/zirobuloxigemupune.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7290f67cbc99f635321b565b4237a09f/duzadesuzavozeturutid.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/jomofuzefanoxewaxutamef.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/26558445334.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/88916683203.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/kazamojigutafudases.pdfIn PDF document text
    • http://madeirashopping.com/userfiles/file/xokobumudazowivap.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109202053229894.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/bowekibus.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/74314773307.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/45854151158.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/zimitofajijazifu.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/fudawiraleworavugabi.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210906212632.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/94505366733.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/bodopurorideboro.pdfIn PDF document text
    • http://zzlhlt.com/userfiles/file/LianMeng202109191434447541.pdfIn PDF document text
    • http://cocoal.com/uploads/file/87894174715.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161503442957fc---27344894980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=print+blob+pdf+javascriptPDF 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_off0000b234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB234 15360 bytes
SHA-256: b04d01dc40100e0c646f9ba0bb39ebcf7bb89127385d7ac23be8dd2d59c5dc38
font_01_sfnt_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 10820 bytes
SHA-256: abb1459c7caf419168117cacb80fca0c2e8f97526c01131eacedb9f165a8e684
font_02_sfnt_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1