Malicious PDF — malware analysis report

Static analysis result for SHA-256 19543795b0147562…

MALICIOUS

PDF

91.7 KB Created: 2021-09-16 19:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8564ecc035b702d27d346af723613520 SHA-1: a0a8d34eb1997318c5f32724016056ff70bfb676 SHA-256: 19543795b01475628d5cf9a86882b93aa41369daecfb654b97f33b92075c45bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to domains flagged as potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://sambometal.com/dataroom/file/89021401326.pdf In PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/jopuwuzafonilug.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/sufaxa.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/38176989363.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a2c9126fe---milulegonejuvun.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/8507828378.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/4387107149.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/ruvol.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/92050061743.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161319628dad88---82362746285.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/3n2sd66d0c4clnh8m7inb088p8/73715398794.pdfIn PDF document text
    • http://le383.com/uploads/files/munukanifadomugabixufa.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/vodomaxagowu.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/15820240367.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613381190b876---somuveso.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/46381577031.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210905122532.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/wofopitebijojepoxipun.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/47054636112.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/narowewuwoguzuredizute.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/bomowalafusezegisumud.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/9097077550.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/makerobup.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/gopemujurumo.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/nadogutefowigujevatadeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=fast+and+furious+9+free+downloadPDF 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_off0000fda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 10676 bytes
SHA-256: f9d9e2a07d20de19d0a5c4fc385b7464153c7ba30abbb8d093e08a5364368f01
font_01_sfnt_off0001164c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 19208 bytes
SHA-256: 2ac898cf4d33a009e0002d39919ad0a5f9a32f20cff4ea255486108a3eaad976
font_02_sfnt_off000148d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1