Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b765f9320c96335…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 23:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 17dd44e094e35dfa71464907026b2abb SHA-1: cc5682acb70cc13dd0ec08402c77dc571045ec08 SHA-256: 6b765f9320c9633571b2baa1b26fc5c2999da80eed2c96078d86fa431c12e8cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, including those hosted on compromised WordPress sites and disposable domains, suggests a link farm designed to redirect users to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is attempting to trick users into downloading something, likely a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=call+of+duty+4+modern+warfare+ps3+torrent PDF link annotation
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/sesuluwuroboxobarikode.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c95528be78---mufawolawonowowat.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/79255599202.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/84107638378.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141490caa811---sererarig.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/vexijajalarewi.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/jinosulibufezina.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48455924685.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/38994196990.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/71244439686.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/wizafiwaxozodib.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/kiranebajurer.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/51574198543.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/fifidasinevekogezoner.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/vogolunefovazubitowuxe.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/jebuvunuxo.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/24421550360.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/g41uv2fph7oqdhoqk6qpoqkgvk/valuji.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/24957239869.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/52499681563.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/giwisizoletogof.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/luvimezere.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/jivekuzew.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/98999510773.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/78447141078.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/79763517378.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_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 19292 bytes
SHA-256: bd1ca542e9f2807c23c74b3b4b53084df1957a17aba84e52b65fb24f9214ce66
font_01_sfnt_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B36 11148 bytes
SHA-256: 99c91898f072c34cd948f5f9061ce37befd276ce828c8a440457f35a9f742be5

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