Malicious PDF — malware analysis report

Static analysis result for SHA-256 992aa8fdbd0bf388…

MALICIOUS

PDF

101.4 KB Created: 2021-08-11 06:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8acf13d0ffeb34a37e06c864676dcce6 SHA-1: 86a47a049cf917d554bbfe84aaefffd1b8a6dc9f SHA-256: 992aa8fdbd0bf3889d33a062e3e6b05ee615a5ef15960d19f2a28cb8fb9e9b0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9984

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://synergyproperty.com/images/files/17872036813.pdf In PDF document text
    • http://csc-021.com/userfiles/file/20210718211419_v7e7di.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/42e5e2f079d9e1b96dae53b002b9445b/12634355935.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/lefomivoxibemusigobo.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/98302737418.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/pavejisatubeketosodop.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21b46ec11---fadutumitom.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5a82a847---sugafifefukeparub.pdfIn PDF document text
    • http://abnicum.com/files/file/zudulekumebu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/23604108868.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/3b9fe4e396bffab41eba795d2d03cb9a/xigiramob.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f776fadf---61386467384.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/42594306100.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ascgpg79mk7aen9g7lnabul8c6/febagadurugej.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/22978988016.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/gorojurew.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/bujusuxinimogafigijowojok.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b3c020143---50327503520.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/nusutibatepagirogitopuno.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1da27f46---sopidemubojat.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/i31pkjq1lh7rje2rortp2a1420/rovajuxibaniwozedijewili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=opera+browser+with+free+vpn+apk+uptodownPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/943a5c836c67e27a2599fba8ae3887b8/28934810871.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10849 11060 bytes
SHA-256: adb37f2a1747c241e29baebe70745e0644626174e0cbbdfe059797bbba4d4a32
font_01_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 18324 bytes
SHA-256: 0ac735bab50a79d38ec97f9f3a9b183b4da7a02864f3039e2d2e13b414278de0
font_02_sfnt_off00013ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF0 18364 bytes
SHA-256: 7867a7975b5e23c3528d87eddd612655b788acf709deed3463d4242ecf5eae10
font_03_sfnt_off00016e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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