Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdfa96b73fdffbe…

MALICIOUS

PDF

73.1 KB Created: 2021-06-26 03:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76e26e97b7302c50b2f9389e53cde547 SHA-1: 64e2e0d03d288bbbe0e31a97eeb33caea35a130d SHA-256: 3cdfa96b73fdffbeb7f07894112d5447f691dfce372002e230d10672b12afd83
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of these link farms indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=blood+and+chocolate+123movies
    • http://spc1991.com/ckfinder/userfiles/files/92481871739.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/78134bf8f590e382501c9aa40a959776/13374846569.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/m7rgp9cq0mr2e2n7j6evunti73/gowuzub.pdf
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/84979856516.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ej2ot022r3uamsdifb8nq0fu75/gazemukitotip.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086142c5beb4---kupolinevuzunimipu.pdf
    • http://thaiboxes.com/piceditor/file/bamajebetibit.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086976b3d2c6---95553594777.pdf
    • http://stinpo.com/ckfinder/userfiles/files/31082962131.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7cdf68715---79684035591.pdf
    • http://riph.pl/userfiles/file/baforujakokidezedawa.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/44291852710.pdf
    • http://pkynfe.net/userfiles/file/fipapugoxodixilebidomeviz.pdf
    • https://giasutainha24h.com/upload/files/83326521516.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0244094926aa7dbfb684642496d14c94/penimenarajevaxelovavov.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b115fed0c5---47705175979.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/be70d883f35759abcb23d55861575b8e/gupumudopob.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/410a7570a655cf3b5255a41ae9a26821/11126651471.pdf
    • https://agermag.ro/mm/file/9994032410.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b8930bdaa---43771028913.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/21587281255.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8b382fb1ec11a48788624a0b502f85df/wosus.pdf
    • https://mediaget.com/userfiles/files/xinog.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_off0000bde2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE2 16792 bytes
font_01_sfnt_off0000d5f9.bin
51072815135ea81c6e653af87d8847f1bf1e4c05ec5d9126555125c94897afaa
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F9 10996 bytes
font_02_sfnt_off0000ef77.bin
a7af52b0c5c2008637972a9763618a185e894ff63e20b206b0776ef244104da6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 15368 bytes