Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1973a8f630c0de…

MALICIOUS

PDF

107.7 KB Created: 2021-07-05 04:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 457e0794cd0890af455db21f269265b9 SHA-1: 6fd58c3898de54fc863e792a2a9a6982c4930eb9 SHA-256: eb1973a8f630c0deabe9850fcddd542f7668c694a33fbe7d52220ed6d34387ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous URLs are present, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's used to deliver or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://crewmak.ru/uplcv?utm_term=a+road+to+somewhere PDF link annotation
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609e55ea13c69---xuvevonuxisuwijaw.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088665e9f9bd---pugabukir.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/baxeramirupagavifabomikum.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0de8d8a8a---85807106182.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/motureikhaq6o31hphspv74ml4/24037529990.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/vig6k6od29uh9n479t92rfrv73/mozosisajesutofonisiru.pdfIn PDF document text
    • http://abc-tel.ru/data/File/46727879930.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb838a1ee---80463497438.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa59e5e24ed---vekenukobudemo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/61742170693.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec4d32958---povulujejis.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/gurujobigasefojiranigekin.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf37ba3612b---42003605565.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9bc93a2d568a8b0564cb6f900004723b/71326232831.pdfIn PDF document text
    • http://berbun.com/user_img/file/goribasufenadiluw.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/59835022683.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855f5cf2c03---54818824081.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/toperogosul.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af65774f7db---xuxix.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/61181287790.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/xomepaxidijexefase.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed779e5deb---28046095583.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/55866756879.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/60506180182.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/60999911114.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_off0001437d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437D 17980 bytes
SHA-256: d121dddd9c303a56d35821718698ac264d672780eac461838241a661fe4be2c6
font_01_sfnt_off00017223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17223 10336 bytes
SHA-256: 1dcb2523c2876106fab49128c6c73e256252ffe9ec3512d6ffac3dd7e4d82842
font_02_sfnt_off00018993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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