Malicious PDF — malware analysis report

Static analysis result for SHA-256 943fa15b0e765c2d…

MALICIOUS

PDF

70.0 KB Created: 2021-10-04 09:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b264673b60b4db7ec64eddb943e80f27 SHA-1: cdeba73529232dda1bc38fad588256d70a1487a4 SHA-256: 943fa15b0e765c2d83ea8d636b1092c6ab3f5a0b996acb53ed578201d07d1565
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains associated with link farms or potentially compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content. The primary attack pattern involves directing users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://noventa.cz/media/files/file/rorinexenatafugu.pdf In PDF document text
    • https://1000families.eu/userfiles/file/vakurexozujopukakisonod.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/61207742966.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/jomulemabe.pdfIn PDF document text
    • http://skisun.it/userfiles/files/kekexolimawexinowexexupop.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/tezibidevi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16135664b1344b---56695109856.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/mozurulot.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210902_010632.pdfIn PDF document text
    • http://profstil.az/userfiles/file/99568830409.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/59592940983.pdfIn PDF document text
    • http://kco.su/userfiles/file/kuviwe.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/xurukupidisojer.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109252245423988.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/39840467093.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/pakovifelaxasu.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/fipido.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/ganowuxetaseduxadifetojaz.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/36080975800.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/07daa02301e445dfaad60b3354627804/53888650617.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/61e12cd3ab9139eafda203ca62cf470d/soxaxodugorapofore.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/97937045622.pdfIn PDF document text
    • http://kgmda.com/upload/files/nuvopilusunimi.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/58820576982.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021100323564291.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16155890229a7e---81095313375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+shut+up+and+shoot+documentary+guide+pdfPDF 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_off0000b129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC940 11200 bytes
SHA-256: c3ac06e07e56c5aac9cba61ee9c526e518d6c21a5e863d0bbf7f495f238d35ad
font_02_sfnt_off0000e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 15288 bytes
SHA-256: 6c4491ee2632ddf4db8706101d09636118df38155ceff6a4feeb01963f04fcdf