Malicious PDF — malware analysis report

Static analysis result for SHA-256 21613c9969093da5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 08:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 51d344f8bac29e435ad0275adadb2516 SHA-1: c3d2c1b618719c8d9e95485b4453e30ab02b812b SHA-256: 21613c9969093da5fd38106f5f31e899d4772d3138f70f51ca6708bfee822c63
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external links and the 'link farm' heuristic suggest the document's primary purpose is to redirect users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://universalestetic.com/userfiles/file/44623446748.pdf In PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/vipuwejigixusiwib.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/63340572243.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/29214432304.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102b2a29c586---sonuzitez.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741043c916a---5786431747.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/53183527758.pdfIn PDF document text
    • http://yuha.be/_files/file/kumajujelapugodan.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/fusugug.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786e56199a0---68296073199.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210620022241.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/63366693678.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/171a55f95731477101db01066262a547/65630970027.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/fidaxunivorurazek.pdfIn PDF document text
    • https://capecoralliving.com/media/file/birovemarufaroxorajin.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/rowodokezeka.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/ruwasokizaf.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786e382be1d---jipetiwole.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/rasitaduwuduse.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/19va95rt1d145ufkkdkg95fomk/vosibotikilubobiwevonagat.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/xuzewirapim.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/bilodiwum.pdfIn PDF document text
    • https://hgb.se/filer/file/88878442599.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8afa7709d2862adce1d1fd676a19f0ff/sisibimitaxepokavakabi.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ee6ebe7b136565a47ee33875f3e79350/sifidinumiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=discrete+mathematics+pdf+for+bca+2nd+semPDF 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_off0000d6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 16840 bytes
SHA-256: e8ea061ecd4861edeab989e729c695373d1c587a343b2b763d8b2eb47f09c657
font_01_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 11100 bytes
SHA-256: b56e11ba0bf2caac92c689959c508b692080485bba345ac4911178edfa9c458b
font_02_sfnt_off00011c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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