Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc86e5681f9056d8…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 07:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: cbbdd0290b27db10a8cd2b9630f87f1f SHA-1: 562ce4564f1c2e016091e76621e7c37574f24c09 SHA-256: cc86e5681f9056d87a29f428790bc7350ede2d380905c0a4db921b0bd0096710
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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 http://zhuoxinlaw.com/userfiles/file/20210918165714_171236792.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/o9skth29nti090j9ftb1j0cqkg/6886947905.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/26655299219.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/24b25648903bc247c868b7dd88cfb44a/72113908007.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/gujuvevawiza.pdfIn PDF document text
    • http://raczcsalad.hu/files/37813677194.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/wizutajet.pdfIn PDF document text
    • http://yilip.net/userData/board/file/xafenum.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161423498cd4a8---lebazukokekovod.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/84924001824.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109210510231039.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/84666135054.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/xelezujajikenafepi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd83eacff3---55831181721.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/jasidejizag.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/jozesofigopanafudeduge.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/80801990701.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146834fb58f6---tusorarevezofejunubuza.pdfIn PDF document text
    • http://dytac.hk/userfiles/mifijinotodu.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/gelubedisabogaripezutob.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/pijavakusitiperelus.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/5438911182.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/94272109717.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/58525652316.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b270bdb68fae135d5416d91dd42c69c2/xuwakuxujakivawojaxewar.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210922_181331.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/18570466151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=call+of+duty+mobile+cp+mod+apkPDF 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_off0000b75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75E 10888 bytes
SHA-256: 707d2f8e107acb0f43de3fee61a3da92da3f30d103dc3eb29ff1ed8f0408b3b4
font_01_sfnt_off0000d069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD069 16612 bytes
SHA-256: 63f83ca921bf13ec8897c5dffc1d353c7deb98014ec1cfd021ca2e480b15082a
font_02_sfnt_off0000fa13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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