Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3e240a25e33d8e…

MALICIOUS

PDF

76.4 KB Created: 2021-07-23 10:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5bb252b14272fd8a04a90cbfb9a629b SHA-1: d097dff9737db7c1019f84e9cdad9c28f1d553ad SHA-256: ba3e240a25e33d8ea48a3aabf25295d03028812a1941698e2d12237af9698393
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a link farm designed to host malicious content. The presence of a 'download button' heuristic and a high ML classifier score further support its malicious nature. ClamAV also detected it as a phishing trojan, suggesting it's part of a campaign to deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/37324e870f15952a74ef436f324d4ec8/64596348787.pdf In PDF document text
    • https://andrejc.si/files/file/56499022286.pdfIn PDF document text
    • http://elskenecologie.nl/files/74100639800.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8887d23fb---pilulijowagivuzoboloxenar.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/13675499306.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vexegeron.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16b5d01a8a---rojel.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/tegodakoledixo.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/c023hq4eiphl2t6cccfo9djj0o/16022016691.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/tavijipijuboterefigeludo.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/96692332560.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/vobumidura.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3dc83b9ad---80757625176.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/d61c9e4846a9c201e504fee1058ca0b0/35014510484.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/pesabumelizoxugewewasaw.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/81624446009.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4498316b4---dalijaj.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6158887f6---95211490558.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/mixunagifidox.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a8d8853b7f2fdb13b78ce198361ddd38/jixutodezovadepetorug.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/j8hlv7g84249g7er178do59jc3/nedenurujoganelabafo.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/52404109488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sonic+unleashed+ps3+isoPDF 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_off0000c68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68E 10760 bytes
SHA-256: 722e11ae87e1aaf7b83cb14a9fbed96b1e33d56caff973015c864478b0a902e2
font_01_sfnt_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 17040 bytes
SHA-256: 9edfaad9da2accd78232ee48028508a663af69d6c42108f748a061ca47878155
font_02_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1