Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c127f2d49ff33f…

MALICIOUS

PDF

96.5 KB Created: 2021-09-05 05:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1ffa046b3e43c46733cdd52fc3dc8b2 SHA-1: e82f2cac1d8b720d85fd79bd0bd657affa98a431 SHA-256: e4c127f2d49ff33f022e399bcb3398dfe427102ea20f82c122293e17dcfa073a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal being to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/3f32fc5ba07d98f0b8a2d671b1ef5f3b/kugituzumazojo.pdf In PDF document text
    • http://trevorhannant.com/vebazofolapore.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/vukituvanodi.pdfIn PDF document text
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/15060621949.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/79734e04160a621e4e6c564c45e2841b/motozi.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109010056503642.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/molesosediw.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/wurokebomurajamufujutu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a358efa4c5a---rirosuxevadu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/95440842704.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d656dd50d9---mefevejoxepizuduruwewajez.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/b7b82e0bdabc2d0e5b8a34e837230bad/89271301657.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/lakbtgifm09c1rq62t0901jpv0/noxuximawazitagululawa.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/20812673470.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guwegidapoxazasalo.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/7948a1b49510c73b94d292e7d6f0adce/fapaxupojapofisubexogini.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/17387855841.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202162172921.pdfIn PDF document text
    • http://orderkai.com/uploads/files/5581646951.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/wajatutomivefopibu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8862646922e3a12aa8da966788523c73/56008681223.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a96a9434b261fa194fb3b1dfbd87e81/bopadigobokig.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/33283698612.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/bdbe569626d90538118a873143944989/xulupibebafejug.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079304ab892a---rojefafiviwejizunufos.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611aa55a73019---90405872649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=netgear+nighthawk+ac1900+c7100v+manualPDF 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_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 11104 bytes
SHA-256: 89f494f4a2a930bec39e3dcabfdfcefc6506eb1daa8f10bfe2b044dbe99ffa85
font_01_sfnt_off0001289d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AF 19540 bytes
SHA-256: 79a3dff88ee23458f317086f5a0c28862e5f3f74b143c8d72eb3e06ceb3b50a4

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