Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf4e54cb342abf4…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 22:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db8a52848df6308af4277e8ac0aaa5c3 SHA-1: 633edfb1a920695773ae7965ef6fd972c54cd8ab SHA-256: dbf4e54cb342abf47c6ed3442e47af8071a5945e3bf5c9b0830d5b66ccbbfb45
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The presence of these links suggests the document's primary purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6fc0585c7---nezamugagogaxeba.pdf In PDF document text
    • http://domki-kopalino.pl/pliki/2251016556.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/wuzobupodanumiravubum.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/77738647661.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/jedilewibirifizamo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd69562b84---90715398571.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/fb934466687c5ba74435e2ae83d7ac8b/lusitusanubexexow.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa91f46a21---70510436904.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/2f0a96d47508188b2bc45f3e9210b74f/siroz.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b83a547a---fobemimof.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/g13edpjb8ef88tb90u420oift1/juvuwezuzubetogegomuju.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/melidinonebifim.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/83345717296.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/84449100216.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a438546ac2---limefa.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/79402874548.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608432096d193---92071919339.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/mulugobavo.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/ee92b546284e8f879bbd1115e4cd4e9e/44947827610.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/40121895897.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d78065abc6---jajasune.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/7cc0811e3be317c81febffe7711f6e80/82731003720.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/doresasoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=exponential+regression+worksheet+algebra+2PDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1eb6dcc347---rijitijimav.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_off0000cf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 11056 bytes
SHA-256: 3a3fd24ba98d2b6b1811a8ec253272ac8e4bc02352370e948ca9e31f6acc97b2
font_02_sfnt_off000100df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 17712 bytes
SHA-256: 463b272755a6e0c7231dc83996967ff55ba91c59dcb7ee101fcd21d2b71f1d0d

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