Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8dd13c754f1a66…

MALICIOUS

PDF

74.9 KB Created: 2021-09-19 02:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04854bef01376381aacbf21a8a9cf818 SHA-1: 69ad1980e215a79cdc8f3ce5544927b41ac93b23 SHA-256: 5f8dd13c754f1a66c3dc1f3ed3e3bcd70321f580ed122c03ec7e309119d2d299
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ityab.com/cache/fck_files/file/34646805418.pdf In PDF document text
    • http://sinching.com/uploadpic/files/202109170814363922.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/tewaxupebujaregu.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/daniwotofagiz.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/pukujawonixegezupareburix.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/746441dae4b361c0436dbe4f4b58bbe3/8496437756.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/39209394736.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/6018948977.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/luderoze.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16142078d33827---44226333810.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/96a7835365b2c0b0c8b09a67748acf38/vidajiwukupatesojapofimu.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/43569111659.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/63898042127.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/gaxutelunapiwoti.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/nenarusoga.pdfIn PDF document text
    • http://vit-physio.de/file/68725624605.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/vumudidi.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/kowepebibat.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/96500962834.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1c7cc1a7---muminozuladomug.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/gebawekopuluxa.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161370b0951b8d---82201391118.pdfIn PDF document text
    • https://cncunse.com/d/files/35770989103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=percy+jackson+book+5+freePDF 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_off0000bca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA8 10704 bytes
SHA-256: 0f0f1ec51ca38a335cdaecfa5b7047a9a6af374c85db9cc717f3420d1aa529fa
font_01_sfnt_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 18520 bytes
SHA-256: 30b047591537dec09213a534c0f59112763e2d3db0b91ca7d941e4f2d4dd877d
font_02_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1