Malicious PDF — malware analysis report

Static analysis result for SHA-256 217a23b0d3715354…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 07:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba768edf3fe0fddc729d213e085afa2a SHA-1: e65fe9f9841d1d45cc43d7f95acb75a2427a4ff7 SHA-256: 217a23b0d3715354910f15ed172a0ae888add281c058c518099d9ce93ee4b387
164 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of link farms on disposable hosting and compromised CMS uploads further supports this malicious intent.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a19905e28cd---5621979027.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083bef3529f5---jolerimijapavirub.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/115vsrfkovu9ih8b6bnd1tc0u7/30352266922.pdf
    • http://mulroyenvironmental.ie/userfiles/file/pefoxawetexupego.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/f1ae70c49c2e13935851b83d6913aa11/68561044012.pdf
    • http://cuatro-pr.org/sites/default/files/file/16408756821.pdf
    • http://dfh-consulting.com/userfiles/file/doxedolozoxenekodu.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/a9af40a176933f2a2ba510e7725610cc/23008720069.pdf
    • http://apcmagon.com/userfiles/nudulafune.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/dekaresezekasagizifesu.pdf
    • http://halaljones.com/uploads/files/nimem.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1ad16c7e---56314480334.pdf
    • http://brlairport.com/images/file/govawiwodoxuzozajusem.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/2416fb5eed15dcb6c84dc78b0e0d0ab1/58999690196.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160832b74e7327---1620929059.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/grfvljljshfodm9h3din1v63ju/3398626273.pdf
    • http://www.look4job.gr/images/_user_na/file/gafiwakejisilaleji.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b4b0f9ad17695b85b042be4024dffe73/lixozenitexij.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/78062a49aceaeb7d57763e1f5c7eb938/87373374611.pdf
    • http://prestinieurope.ch/userfiles/files/zonoda.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bddbf67c845---54821705076.pdf
    • https://okinawa4d.com/contents//files/zufuxasurikedaw.pdf
    • http://anatolianlgs.com/userfiles/file/tejavozufowigawesa.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf0218d554---senojegavozaweminum.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=send+this+to+10+friends+chain+letters
    • 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_off0000eec6.bin
c8c8a210572001f7b970c370fb6cc7377081bc6b2c8ba1c5999e1a2a69f703e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 10824 bytes
font_01_sfnt_off000107af.bin
fc228e573d54ba47295193c8bb22e25751cd48886e96ef4af833375214a3b10c
pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 16592 bytes
font_02_sfnt_off000132ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132ED 16792 bytes