Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7ab2dace2fa21e…

MALICIOUS

PDF

89.0 KB Created: 2021-07-08 07:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e9e3313d5a692a4a238aa6bf7f348381 SHA-1: 50cfb95128c1bb443bc9c15b2112e4157ba65af1 SHA-256: 5c7ab2dace2fa21ee260a53d4b5e71d0c446dfd2e31475045e60679de8d85d4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to compromised websites and a visual download button lure, indicating an attempt to trick the user into downloading a secondary payload. No scripts were extracted, but the overall structure and URL findings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=dynamic+of+structures+chopra+solution+manual PDF link annotation
    • http://bbfederico2.net/userfiles/file/80545652283.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/28a423861b3161e150a43ec13a4359c6/55771106187.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202107040303131122.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/jafaxebaxabulusurutev.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/5365405257.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/42011604571.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2acc371d85---zepiwumifuzutilefisisepat.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162286359329676434033.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a292d7ec3a4---dolanovaposafolir.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608907fb4b380---gusawukun.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/18f7ad562acbe9b463df828d69ff3c9f/takexenupexofe.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2apiiekaislke655v9abhvvpn4/varapofemaxivaviwirom.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/6457350260cf820cc0e1b.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a56f1bea1113b72582968e34cb8ead9c/gosoxefofoguxobitujeri.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/nbeattkc5gijqlbb5mnc58gb52/75790064900.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/janawovabagexinuwuvaf.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/85745122147.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fcfae8922e365dfc613a617942ad9d6e/44317776772.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620602308.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/foovulnlgdvkmi2did9ur9fib1/45859616747.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ci1tpa1nqa55rejg15ujc2cdg1/ronobowa.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/migezovofeginife.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af8641bf40a---sosirasisow.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2ef1aecc1---68865556183.pdfIn PDF document text
    • 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_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 18276 bytes
SHA-256: 10735aecb1f0270d496b2e5e0a105bd9c5fba3a8bafc5cc2b9689e50e4515a14
font_01_sfnt_off000124ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D06 10960 bytes
SHA-256: 14ccfe3e870b4bc7d8d95ae4047c82379ee80e2007f29050e3b408d7a90faf54

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