Malicious PDF — malware analysis report

Static analysis result for SHA-256 c180e48045a0792f…

MALICIOUS

PDF

92.3 KB Created: 2021-06-25 20:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1c4af4e501cec2b7e600d888a58fbd0 SHA-1: f4378b0c64dcd406f328f7a16dbb58ec01a5fb15 SHA-256: c180e48045a0792f102bb01ccd007f059244735b3e763e6f2daede94400dbaaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the link farm structure suggest an attempt to redirect the user to a malicious second-stage payload or phishing page.

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 https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f80c1f17b---78213928680.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16081a85a2f01f---53601528916.pdf
    • http://china-engine.net/ckfinder/userfiles/files/zaketimitunufuzejuvogixu.pdf
    • http://musorcentrum.hu/files/article/file/kefax.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e2acf0c2f---kedakonowatamolib.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/sobgnli2t06rgt0d0k1933d71b/tozobewagomuja.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17e69c966---gogug.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49bfc59811---sugunozawuzimato.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5d5c45d05---66251956889.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091f1abdec94---28873184863.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cf2d76b96---69453166362.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0591122405dce43d904698be4dcbd853/jirew.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608379e8927ce---86147790273.pdf
    • http://www.sport-konyv.hu/userfiles/file/77797528975.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/pj7slj76klmrru6utge9qj06s1/73773779422.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/18cfea8mi6fc4n1cvii32u3q71/vulakul.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/kjeuqh1h86ne0ek4okt288qucs/96836871779.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a2d6a9f7f---dutuvalam.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ecb9ddf40---4560088570.pdf
    • https://riondene.ch/img/uploads/file/buturipunivedenebuwofaf.pdf
    • http://essuances.com/ckfinder/userfiles/files/vugesiroxavovumesupider.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9459r07o7nrde25cj2i0sanl20/83245341009.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/iorp83i7ljtgk3si3k8f4kvh4m/27825866437.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/696e376df5b248c3503a2be65bc3c112/35540182739.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/7323857224.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=compare+and+contrast+anaerobic+respiration+and+fermentation
    • 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_off00010219.bin
1df6c1dfb23e0e3d3e7dd81c3a8b261a8fb483d7b2b3230fc52344a3c659895a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 10904 bytes
font_01_sfnt_off00011b1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1F 16792 bytes
font_02_sfnt_off00013331.bin
f2d0683905241f1024d0a98b3cf3701a684ae3a6c36aad38c2c38b1de56215f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13331 18708 bytes