Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3b58bc4ba5b224…

MALICIOUS

PDF

88.4 KB Created: 2021-07-24 10:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 92fefd6159db3eb2ac235eee0ad8e113 SHA-1: 8fc3ec19fd27ddcdfa99e085a3b59248569e0df4 SHA-256: 0b3b58bc4ba5b22491d5a16cb39510e11dabc1ef73963c869cc50631dbeddf52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://palaciodelosnavas.com/userfiles/file/fonuzowujareruzivakofemi.pdf In PDF document text
    • https://aedwea.com/upload/foto/kelezam.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871fa7c927f---5864452679.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9221e9b04c---gevuwokezu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160968a3f43492---14054789520.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/q3f333mq2fk6eetsd78jevmn8i/39219327492.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210620_180440.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/6625322950.pdfIn PDF document text
    • https://efnnma.org/files/file/pisonatejemojunidasegaza.pdfIn PDF document text
    • http://krzeptowski.pl/file/6716506698.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/87982127678.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/wifadotijip.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3bb429334---24618766481.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/58225958449.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/bufakametiloguvixorinodi.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/vaxazufelabazilil.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bd023327e---75875828151.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/24724208247.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/30932522569.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/zolipanawonaworelogur.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebd006602e---85201285658.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098edf50e0d8---kotiwexubotekopu.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/33vkffk0vaknbhiubatpilnak9/lonozapowuxifavezilebijux.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/40928040626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=piano+chord+finder+software+free+downloadPDF link annotation
    • 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_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 10660 bytes
SHA-256: 60236fa6f4af3825bb15d53b447675dc5c9ed13497d5d4265892b6dc3be6b7a6
font_01_sfnt_off00010dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBF 17116 bytes
SHA-256: b8e6ea8854c19fa9bbadac577545bdea8f0c5a6ac9c7c30ffd76b487d1fcd07c
font_02_sfnt_off00013a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1