Malicious PDF — malware analysis report

Static analysis result for SHA-256 a763bd1815b370a1…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 22:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 575c73c4e3b39d4ebcd5e88052b08243 SHA-1: 2975821bb9646dd2742d77c60c8f47d94fca6adc SHA-256: a763bd1815b370a123b3a7f924de061bdced206be2ffe2ded9a75ed773d33455
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082cfa4e5c26---87876316876.pdf In PDF document text
    • http://serramentisiciliano.it/userfiles/files/20827518901.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611c3dcc438a2---28234070366.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/48695796632.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/43134832217.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/oecaqgbd3l89j044ft6m7op0gd/nedosupejexugimelomofifu.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/62915973555.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6f5eb88e7---xusununeb.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///26280233297.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ivbvmniho7r3rvgkifgokvvtb9/pukolipewoxoxodobufat.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/bitamefu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160984c99e7812---minusu.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/dazojonoxegijifesekiwefog.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0701814e71---foloziwekoberuvun.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/26870290763.pdfIn PDF document text
    • http://novichiha.ru/pic/file/zopijivu.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/54426531583.pdfIn PDF document text
    • http://ibb-online.ru/f/file/moledidasa.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/bilomurinezovikedajegawa.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/36171350464.pdfIn PDF document text
    • https://jjpremiers.com/files/xadiwetif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=arissto+coffee+machine+manualPDF 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_off0000df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 10680 bytes
SHA-256: e7c96db53d7d52ecd95b808bd5a0375b3f808050a134ad785aa66e15ac9937f5
font_01_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 19400 bytes
SHA-256: bf20f404b5588f47a0aa6b104c7497117118818987a6f118787c455c770d425f
font_02_sfnt_off00012a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1