Malicious PDF — malware analysis report

Static analysis result for SHA-256 a015c05ab20ff56d…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 21:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a6853d96ed98517614202bcddb804a62 SHA-1: 710e1fc031fa73bdafd242f150a359e594a8638c SHA-256: a015c05ab20ff56d69079817fa9ed26a08e1eb635e6e25b2db70b5a479471699
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites. The primary purpose appears to be to lure users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://queure.ru/uplcv?utm_term=penyakit+steven+johnson+syndrome+pdf PDF link annotation
    • http://stardentalcare.org/userfiles/file/97839028537.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727aa3afd3a---60929014904.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/49998696c393791ed4fd4b125d1d7b27/mavowoxufiravezaruporus.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/favezosevav.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2277b12fd---85113577365.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/61409263227.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/43076580078.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/13661059346.pdfIn PDF document text
    • http://yuha.be/_files/file/jemuvunasujupolanegefum.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210601_222952.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/89055141557.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/warurekugo.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/tofizevusufajumovupukoru.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611f6eb69ad06---goratowijetuxopobilozezep.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/kabevekegavepagagaraxew.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/68388559087.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/62869400697.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/genurugodiba.pdfIn PDF document text
    • http://industrialdevices.in/uploads/26497833768.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/zixerunave.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/diwokuwil.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/24660225116.pdfIn PDF document text
    • https://istanajp.net/contents/files/bijopotazifoju.pdfIn PDF document text
    • http://broomfield82.com/clients/4/48/489ff1710263d1ca947d92387d56c809/File/56512652111.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/kk3934meie9vpr86rp8hk8rn6q/navuxewu.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/jerubinivisowirezatudese.pdfIn PDF document text
    • 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_off0000c264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC264 11120 bytes
SHA-256: f93658a1027ccb0f0fe888e80367d29c7b462c83021a9978b30e60e6df007410
font_01_sfnt_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 16508 bytes
SHA-256: 462030f9362d60335ad4999d9f25c1cb5496ee83947a1e106506ed86a96d2bc9

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