Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c58d97f30bd226…

MALICIOUS

PDF

96.0 KB Created: 2021-06-26 01:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1034fada50b48bb2c74a26e493576fd SHA-1: 5b25319aa4381d8a76db08abb80f8a5410ab8d25 SHA-256: 64c58d97f30bd226e02d26d9fec4ddddca9d21676f4008c656014b16d8a5fea1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lead users to malicious content or further stages of an attack. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://ipublicity.cz/data/file/wimexupodalabemoxefabiju.pdf
    • https://cgeminfos.ma/upload/file/77106579974.pdf
    • http://king-ber.com/UploadFiles/file/20210618011736280.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/p6v728e52qhv7ieuca0p2811d3/6790884975.pdf
    • https://bamfieldrental.com/userfiles/file/92899471671.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebcd14d451---74563925483.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7c392728---23857009989.pdf
    • http://mispuntossaga.com/campannas/file/wisosogifidebevi.pdf
    • https://1877painters.com/FCKeditor/file/50561578653.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749232b5e04---95347492173.pdf
    • https://chris-arnold.com/userfiles/file/80592955870.pdf
    • https://lbassicurazioni.it/file/kiberovibutixikegeje.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/cdc7e229f1ad54b7300690cffbeeac77/tirefovovebalewuzireb.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/aa9e6e3524168b738865684cbd4e6b21/jixolazazuxosavun.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/e0cef38f2a96e75518f94f1a63a839c9/92804254564.pdf
    • https://b2cexpressdemo.com/userfiles/file/tonilukofoponovirewideg.pdf
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/369400a83f69fe9272872deaf0f2551b/5198715342.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/rqs5qfk4dlb3j61etr7cjlg7h9/60151288625.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/dfe7feb5178ad5444a1498b5c77b287a/jujazesizebuv.pdf
    • http://ngor2-3.com/file_media/file_image/file/kavizixu.pdf
    • https://tempegaring.com/contents//files/75293405260.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609edba32a360---49146023039.pdf
    • https://sonarmusic.hu/up_image/file/12416763214.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=linear+regression+analysis
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B3 16792 bytes
font_01_sfnt_off00012dca.bin
6fa9e56c0df86541053ed46bdfa40213932176e59513ee91394987dde8d9a8e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCA 10256 bytes
font_02_sfnt_off000144e8.bin
f22b02c122a69bbcd55424e4a1e8a524c32a6b04e5187c906069bebf2c8b90cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x144E8 17532 bytes