Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b84489f5a60865…

MALICIOUS

PDF

73.8 KB Created: 2021-09-05 17:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ac9711b632ebcbf64cb4be81b456381 SHA-1: 6904b15dad09ff622ca2290c7241dcd23990b2c4 SHA-256: f7b84489f5a608657574177af3da5aa607b397cf926fe8d9262f2c03fad33716
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on 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' further supports this, indicating the document's primary purpose is to host these links. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=little+man+computer+tutorial+pdf PDF link annotation
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b40b671a04b---70217739969.pdfIn PDF document text
    • http://sivam.pl/files/file/dipepawipuxedaki.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/28213044879.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cc88e6280---15291278856.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/fuvaxe.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/fubuwo.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/cb9d9f01301ecaa6cfd563be99d9b0a0/vobanogowuledujoxokino.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adae4d7fce1---mozopeso.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/47707785603.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/gesekalabaxikaxopegapegaw.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/wotigatonubevepamik.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/zaxetesukiranutuj.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/xaranejaxi.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/45953311430.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/65678525420.pdfIn PDF document text
    • http://voijin.com/userfiles/files/42963798400.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b615130d0c1ffe24c675cee998691ddc/waxebuvogofafamuboxa.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/98344754743.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a397b2ba1f---89465977991.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/855c60ebcefc16d4c9749afae6e7a5b7/91049313553.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2299356a9---86561000165.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/bipibosanofamituzan.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/30464127925.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5cb5a5d9rt3u3o307h2kl5v691/49795721060.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_off0000bcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EA 10668 bytes
SHA-256: c823bf1ee0c08828aaf14a9a6002574cfbaa19f11430f9dc29bd86f3f9732e3d
font_02_sfnt_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 16520 bytes
SHA-256: 6ba5d248381fcdca1d6fb6fca7f412df497a79bd4874d0e65edc53334681a0e5