Malicious PDF — malware analysis report

Static analysis result for SHA-256 833709b4a529112a…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 16:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe7c72fbdc78b381cdf1a981523353c1 SHA-1: 283e61c5ad9f45b96c0a082e675428b00464a85c SHA-256: 833709b4a529112a5d911a7f4ec469a63107f39fabe151e5760812e10f1c0e9a
164 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 to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cpsguffanti.com/uploads/file/64459093693.pdf In PDF document text
    • https://aymfly.com/aym_image/files/pesitomokufegarese.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/nuvudikozafilu.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/noselenobiluzimegu.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132e661703e3---85670961544.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/muzupukejupanukomig.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaebc0358d---faretawi.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/mipabaf.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d8019aaee---lubobajumatemiraki.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/32148632441.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/5778915385.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/74955807940.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613536406dc6d---98133668041.pdfIn PDF document text
    • http://amdind.com/userfiles/file/demefopadodisolozu.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/sipixonetugemevaroboxedon.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/nodororuvubidomipowogex.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/gagumakunaz.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210913151439.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/23341123481.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16131bf8153a1c---sogogu.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/37469572618.pdfIn PDF document text
    • https://hssanesteban.cl/files/janafezumozalobafituxin.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/28588442638.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/pogamabixigexuz.pdfIn PDF document text
    • http://abpaluso.com/upload/file/bevawunujexamobabaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=helicopter+sim+flight+simulator+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_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 20052 bytes
SHA-256: 4a141d4924847ebcc6fd4bea2b6c8d1be1e6607da534cef342cf1761e84fb36c
font_01_sfnt_off0001165d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E74 11148 bytes
SHA-256: f6072ee0d5e1c49980fa830e776d8cb3fbacbe7fc8e546700f4b18ef55dfb206