Malicious PDF — malware analysis report

Static analysis result for SHA-256 7133c8c41f17294b…

MALICIOUS

PDF

83.8 KB Created: 2021-07-07 05:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fe1eb1c6ee1651882932f3242725c803 SHA-1: 198059e06df3d26da79d207cd05669a3f47bb805 SHA-256: 7133c8c41f17294ba73dbb47c6a1c2ca0c9fccf26e3867dbe137c8d4daa33505
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure but reinforcing the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=whitening+teeth+with+ginger PDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/45cee6f3b9208f0c181ba3703fab4142/melupatejakafa.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/83670205868.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cfc58137---37969511522.pdfIn PDF document text
    • http://rentaruedas.com/files/others/buzubarujuketili.pdfIn PDF document text
    • http://becucci.it/userfiles/files/86097063170.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ol19kjrff037e804a5gi5e55e2/fipumi.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/92074977865.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/jidowokuloraxipurobevevo.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/kubuvetegawen.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d7fe3bed---bogulixuzowul.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210706033002_fsbevn.pdfIn PDF document text
    • https://anaksemut.com/contents//files/79657445702.pdfIn PDF document text
    • https://thepainter.asia/upload/files/gofikirinonikonozutamuduw.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c067515e9ed---tenuwurogevisaz.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/2131508533.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609b12d96eee8---ladovikipasidinugapi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608eefd00114c---64364729394.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944f430b8a2---zodilowokan.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/jovajevunigip.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/digodaveza.pdfIn PDF document text
    • http://thedreams.cz/files/jebozekisegeke.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/276de2e9fd951f6a46c2fa4d2a273b22/8425799527.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/17224365516.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/kebomo.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1384d7fca2d7bbff93361641906a4692/naruba.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_off0000e660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE660 16788 bytes
SHA-256: 510d095960ee27682619ea011a7222718c7fa1a117c634057a3e85d31272ead2
font_01_sfnt_off00011238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4E 9968 bytes
SHA-256: 1ee85d92f959845b3f88213859357b9b60c43d5abe4fcb410591bf48ca538a7d

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