Malicious PDF — malware analysis report

Static analysis result for SHA-256 c346aa24d9aef6d4…

MALICIOUS

PDF

106.9 KB Created: 2021-07-31 00:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25f0ba8531c9ca6501cd8761ab8a280e SHA-1: 7be6d399bd02311d629d3f9801d16e007fbee9e6 SHA-256: c346aa24d9aef6d4de8d44d3696a115ff762c8d1562b85ea557fc864596a2c30
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and other domains, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and link farms, coupled with the high ML score, points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://derey.nl/app/webroot/files/userfiles/files/gulusimazososovar.pdf In PDF document text
    • https://jf-orvalho.pt/userfiles/file/73618650976.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/d0a8u8a9451bso77t1i0bh9n4l/bubaguxaxavowuda.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e123a39bea2aa8fd3c7807911050bbe6/lorekubarawefifosa.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/zikofujar.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/pepizisefudenotuwugoturo.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/divaxurunobemorikak.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/45932148366.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/31413121824.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/10a84def2c37f17bd79b83ede3459a10/solidebetenevarur.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/9iuim64hiaccg4tiolelckslk6/zosinevupogobubofile.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/f96e0c80866aa3ae7b9168e722dfc763/lunevida.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/8442451340.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/52030470061.pdfIn PDF document text
    • https://parkettworld.com/upload/files/patixonataribisodarifevuw.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd965b47f---40938455434.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/595261205.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/mawanazawesomebanuda.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/c8d7b5a02347b31c84454d805e670415/xarutijikebatoxopofutaxal.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b9c9fcba70907d59f746e255ca8e98b9/josinukumazotisute.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/94256964789.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/udtah7a12brb5k0gbd924c0vbh/70252733405.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/tasurelenegakumilid.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/76875720161.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a00bbe2e892---51317397684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=can%27t+open+ics+file+on+iphone+ios+14PDF 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_off00013f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F21 10672 bytes
SHA-256: e622c929c2301fc706a19d49f94542b3aaa09524332267477e0e0c3f0f3d4e1c
font_01_sfnt_off000157b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FC6 17364 bytes
SHA-256: bbcb88d5eddff2aa236d7bb448a4ec8deb3cb0b10dd63c4b540c527457e03d8b