Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11bf9ee3b83ffe2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 16:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce70e04782e536bd9b4bb7d1a4a39e62 SHA-1: 99d113c02d51a0b275f48a40d8e0c15920c74825 SHA-256: f11bf9ee3b83ffe28cc7b812e822dc2e64cd11cdb2236bdcb5641facb8d2e80b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 a link farm pointing to numerous compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://coretry.ru/uplcv?utm_term=aircraft+autopilot+roll+control+system+project+report+pdf PDF link annotation
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a8a119b552ed952e9ed1b2b423c3184f/62627381089.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161092936dc8eb---21141657723.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/judozulasijidawugamera.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7fcf8c7b56---dajuvekegiluzekawupepamaz.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/kegogejororijo.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/21535465295.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ca77bcaecd0c1aed5de08db7e85f1f10/64994688823.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/77516919174.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/52323240220.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/82407875103.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd25641bdc---45845549033.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/mejinapoxevojudepi.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/61248917718.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/32675480097.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7cd3f1059c4fae06e71610f7954e9585/64556310449.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4bf1a41ba14d8ddda37908169854ba4d/81263895155.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/02f610257240d7d4defc79658bdc071b/10126688989.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb563745e3---84613888014.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/woxapevafe.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160aecf677c7e1---kilirudajusopanet.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/10263762729.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/2b255a3824f28e5e38bea002a9c46e17/80244284952.pdfIn PDF document text
    • http://mobiliteit.nu/files/62971869958.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_off0000deb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 17856 bytes
SHA-256: be8787520fcf76f2c4717529e214d9082681c95707c59a8282d9f5488523ab2b
font_01_sfnt_off00010c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 11108 bytes
SHA-256: 9d48717d37e6f261c6e7cb43d1e683bcf4ce0af78ecac01de84a99142ee07c63
font_02_sfnt_off00012665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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