Malicious PDF — malware analysis report

Static analysis result for SHA-256 405354bbf4c1a752…

MALICIOUS

PDF

89.3 KB Created: 2021-09-03 19:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 27cddeaf7591eca91b382c7a4a5e03c4 SHA-1: 9c219c7df4c59249ce55fa6c204f6b3d861d5ef6 SHA-256: 405354bbf4c1a7528fcdc45bb7a570ce87837638abf09e24045bc3f90134f21c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/60kcjc7arqc72j056e5liashh0/wazegebik.pdf In PDF document text
    • http://superfasttv.com/uploads/files/17344349843.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/10751222368.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/49082395344.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/ropixaletetaboge.pdfIn PDF document text
    • http://goref.ru/files/file/navizepebegu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607291c3f2383---zogokuxame.pdfIn PDF document text
    • http://poliinc.com/upload/files/25661693411.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/23156126629.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/poluvozox.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/gelakirisipigozisige.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/7025873858.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/wewugodidexunububisu.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/duzepuromilatas.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/ralij.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160843365e911a---riduragogusiki.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/194haudkard348i98atqfsjtq2/baxaganezozinukopivawev.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1610859641e9c1---9293694912.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/vesototolur.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e81ca776e---pabewadazif.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/28535927685.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/bexojun.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb008de3c8---vefidiratojezemomonuzeg.pdfIn PDF document text
    • http://thaide.org/userfiles/file/4392979845.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/30194846177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=concise+textbook+of+forensic+medicine+and+toxicology+pdfPDF 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_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 19012 bytes
SHA-256: dd2b1670c4ab16060ff57403b8995ee2cf193ab8888ade454fbc01cb9170d7df
font_01_sfnt_off000123ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 11444 bytes
SHA-256: 80a6e020bbf9d8cd61b5e4890d51e31ccfa586f5dbeb0e531375d045f9c9d811
font_02_sfnt_off00013e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1