Malicious PDF — malware analysis report

Static analysis result for SHA-256 775d1eb973968c7b…

MALICIOUS

PDF

86.9 KB Created: 2021-07-01 00:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ad381bfe35eb7973ad49ef29f4e7366 SHA-1: 142636002eb5c8764c9ddfc0196e286478cd80a5 SHA-256: 775d1eb973968c7b9f26270ba859a420d206731429f87309b4bf44f2268376ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. The PDF contains numerous embedded URLs pointing to potentially malicious content, leveraging compromised CMS upload functionalities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c602e8f41f3---naseneximuxukotikuru.pdf In PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a2eddf09a7d732866dc3c81c31c56122/wukozudureparoto.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/butobilabojugokamekelot.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9e5cc8b35---36548055390.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/8330733761.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fd5a2803d---7637562643.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/1a7af141928943006617dce8e49ba43c/sarivi.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/b734d001e19152e667c5d75a30632ad2/22108247592.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2b1bc7864---vivilu.pdfIn PDF document text
    • https://diphong.com/uploads/15909912795.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/pumonidatez.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160836f4b9b5a9---29557098546.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725433be5b4---9103600069.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fe56abb01---bowadoretexizurajiwonaxi.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607466ce546d0---51448064979.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4ec70a603db9898cff3f479cfa26ceea/pomebutivemi.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/10120355986.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c9495e2b6fa---pipufasotololore.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16207341420764.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5b1b4995a---34495103578.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/lapugomegoledo.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/36931648192.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/156c47df850fa259c7fcb0f6d0cf2a5a/zikipivoritotij.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/62525566387.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/pqugsmuqu06h07kqhaj5dc3ad2/sezimuturafamonugu.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/11014400321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=quick+hiit+treadmill+workoutPDF 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_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 10700 bytes
SHA-256: 1010c3815fa2107945a5792f3f668bb04fce7dc4a13d41d7f64405dc9f2d2178
font_01_sfnt_off000108a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 17608 bytes
SHA-256: 46f16d652aae80fa124b54268bd7a06f84d50e11b0655035e40641aed070929f
font_02_sfnt_off00013640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1