Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d2a2d7647d7026…

MALICIOUS

PDF

100.0 KB Created: 2021-07-25 22:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cb68e38bd3adf2f5fec5a152b9b58b5 SHA-1: 6a3c0e56431b9d5bc57175ddab8811f99a090113 SHA-256: 23d2a2d7647d702602d142be41fb77a2c2415d57514b7c9c4848d35121e60a1a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://longarmquiltacademy.net/fckeditor/userfiles/file/16599947109.pdf In PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/153db0afccd28746b17b38d61cd2b2d2/62779423081.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/94500370093.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/tezotup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609416e2ecbea---47738038947.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c0d09cb69---tajikuvokerarudagomel.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/55667554054.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/98707235334.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/jerit.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/74483238895.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/05c348cb027702a922bbfe7ae139ef8e/31502067561.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6fc29dfcb---loveruwe.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe4a856715---duzoduluz.pdfIn PDF document text
    • http://goref.ru/files/file/22497293251.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/dizevanogobowefumaline.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/nuwubo.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608504cc763be---baxezodisibesepenotore.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/79741308597.pdfIn PDF document text
    • http://www.grifin.sk/files/90856467616.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160aecc4c8ef7c---zemopuzilusonujuduropo.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/25347050828.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091c172be524---57471776966.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/rifapuvizagur.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4d630ea6---7714016973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+connect+samsung+tv+allsharePDF 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_off000124a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 10828 bytes
SHA-256: 618cac4ec75b4a147c7b410b37dcc46d0e1d50522f74d076454d8193c0e55f33
font_01_sfnt_off00013d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001558f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1558F 16596 bytes
SHA-256: 1b6f8b7bbccc2af19acf2363f34ff971a6cd4194d8d9c7d97cdd77cec468a974