Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4eaa9318d4b09d8…

MALICIOUS

PDF

84.2 KB Created: 2021-06-26 21:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0fc51b00f81f8ef7bc5c228fae3b0414 SHA-1: 1cb15ba1e997e2ae939309ca208cb3ad7c3ec61a SHA-256: b4eaa9318d4b09d89fdf6bdd834a77c3132ed315357c82461865758a1dc5e101
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and a compromised CMS upload. The ML classifier and ClamAV also identified it as malicious. The numerous URLs point to compromised WordPress sites, suggesting an attempt to lure users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aab9f77bec8---tepugopigirolix.pdf In PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/72df75909c378cf8a6625d9717e6bba4/60735093862.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/isrr2pjes1iqq5fs85u2dtbvsl/25196734667.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1dadaacc1---duvifozekud.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b2c73e0f0d23b3d6f4c0232efa6f0d38/8549513458.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/teokah39lt308rv371848fr8tl/patalugofudija.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/91997833957.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/17466551652.pdfIn PDF document text
    • https://lasanisports.com/files/nuzirebivunosajep.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607444137989c---vugibakefewe.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc69ee59b8f---81929248479.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16087855f693e2---zizelegenokodijikipu.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/sa9ufc34drd50g49f7uu5i320f/16790440427.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a77c0951---56843707381.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/vadolonegit.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0556a4be---valitolujab.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/428a1917df859d545222abe366b56814/vuropotavibuwiwivezif.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac81f70fe38---zitukotejafovor.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vamatubedirupifezumas.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/arpch9254ki7b1rcmfvdvh90p3/23253018021.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/minewozizajogubek.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da32f46248---49825681469.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca4cc11351---63768251784.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ts5vn3st98fti99n4lei68qr8v/sekokekugodopalor.pdfIn PDF document text
    • https://longhoang.vn/upload/files/33843679024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=left+right+and+then+left+lyricsPDF 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_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC57 10704 bytes
SHA-256: 97ba6af7139afe712e01b7a027d71bcb80ce96de3e9b5b00dbea7a43b938437e
font_02_sfnt_off0001149c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149C 17864 bytes
SHA-256: 580ca3a3df53be8fe8796c54cb5e4f4ab933aeb9ebf532c9aec02f50b6bd83f1