Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fab03b743435516…

MALICIOUS

PDF

88.8 KB Created: 2021-06-30 02:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4c10cd8bab1cf031543d259a8014974 SHA-1: f8df58842601267824a6a8945c111339114b568c SHA-256: 2fab03b743435516060356f2e76a3190fb1dcfccc1c8997df8167d9c76229a5b
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous external URLs that lead to compromised WordPress upload storage and other disposable hosting sites. The presence of a 'download button' heuristic suggests a lure to trick users into clicking these links, which likely serve phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=things+that+rhyme+with+circle
    • https://heritagecambodiatravel.com/userfiles/file/72084529306.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/gccgvjfkphccr672q7pvrfofvq/41206994631.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ca4f7848908e34c380adc041bb85dd24/11877545896.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608665d4911ad---3544933346.pdf
    • http://cwesp.biz/upload/file/26437113804.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb75d9064c7---dizexigetogeralanis.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/d22qqfrajj559dmuaure3s1vk6/63112395179.pdf
    • http://rotarylaspalmas.org/documentos/file/ratixetuwumoxamuporuvopid.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16095b140e11e9---lutukivasovuferudadumigul.pdf
    • http://amuseonline.com/absite/userfiles/file/dodivavuxawufife.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85be0165f3---vijotaketulizuk.pdf
    • http://konyaozgunmobilya.com/userfiles/file/20759526859.pdf
    • http://gramercygrand.ru/files/file/kurosisideras.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcea917e0d---18817496915.pdf
    • http://mini-garden.ru/userfiles/file/89500407719.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/85bc410e26aa62983d1b67ea11c5f195/serigavonikolarokezedodob.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac253a7848---dodifusexizekafezosisej.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ojr7nuh5vm8u53l7kmso19neh4/2542709795.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f9d44540---dufexarifelig.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d90d40e0a---50975931357.pdf
    • http://thunderstar.cn/userfiles/file/20210522031049853977919.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b62f673b1e---77921478314.pdf
    • http://aihyang.com/userfiles/file/goxewaxasovukasiz.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/d18704a328d3e8a886b8ffa537c0cb34/wujexavifu.pdf
    • 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_off0000f7d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 16792 bytes
font_01_sfnt_off00010fe8.bin
79b0f790075980e9ed7e458e26920e59c7e3e62224e52b8d12d2ed4e3b590857
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE8 17404 bytes
font_02_sfnt_off00013d76.bin
9857b2e2e717d3016e6d8255e4394e69492faa888439709a2984fbc3ff2030f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D76 10720 bytes