Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e331b7f550f21e…

MALICIOUS

PDF

70.6 KB Created: 2021-09-09 09:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a5de7bfcb0ef49367744e46e940d617a SHA-1: 4f330b240911a327817ff2249dc5f9c774a35941 SHA-256: 76e331b7f550f21e30f1486e4e51799b90bad4a9f7597d08edaf1edd91c04719
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://crysiq.ru/uplcv?utm_term=how+to+recover+my+google+password+from+my+android+phone PDF link annotation
    • http://soft-pro.hr/upload/datoteke/20240568309.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/pomaxezerof.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6003491f---tagima.pdfIn PDF document text
    • http://vipdiler.ru/files/file/6493609579.pdfIn PDF document text
    • https://apra.pl/files/file/dusewogutikopidaleze.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/51003099800.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/lodl5p3erdett3mgoen0enuubt/lekafujagolikubixik.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a618bdcee---9847951460.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/385627216.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5fccf71f---29823279427.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/zijuzivazogi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/72862dfdfe80bdbe29b80252616e64d9/21911603535.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/tusinutajupapiwuwowenemiw.pdfIn PDF document text
    • https://domilot.com/uploader/files/6933398980.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/28458494164.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/63510540609.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/48573486521.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/vedugovoguzo.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/52069091265.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/28237808043.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/parodigazumebegalupoduv.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/wemexodorobaxul.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/modadiwovebepopaben.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://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_off0000b737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB737 11324 bytes
SHA-256: 4367c9809241a94901ecfe59d5e2b5fc54fcb924437b408d22bfa0ff8b121758
font_01_sfnt_off0000d179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD179 15596 bytes
SHA-256: 310ef7d28dd121db056d2068b7d22fc37f047241bd13e1d7939842a621cb62f5
font_02_sfnt_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1