Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8097e040ca210c…

MALICIOUS

PDF

103.5 KB Created: 2021-08-02 12:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 52fe038ca392b13571c43a1542c34943 SHA-1: 51e4ef69da616e0dc255860bd91da1a1a6eb0b12 SHA-256: 4b8097e040ca210c9d6789de4cd162c10703bc2ebc1a36bcf4337f2c3f31d380
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd9ae7082---49010826935.pdf In PDF document text
    • https://aplusadvance.com/naver_editor/data/file/21292027265.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/db9b516db2a4b6899388a9f436532191/tomis.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/nenodasibujexiropipaneni.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/efb7396c414657a531781d8b2d46ef58/86630701962.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a8924db16---fujonabufuxiwut.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/83672585437.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/37147277757.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/85854563413.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/39649234433.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/1d11r514fp0p0dn14dpsuqhuae/30165084404.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/91315ff194f6ee684c6e596bb3ec4f9e/vidodipinonamalolekilu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092829a39b12.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/mipaveboxigisinarovabe.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105af4f70d1b---18023018069.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4f99b54b5---91119476268.pdfIn PDF document text
    • https://hgb.se/filer/file/78416891559.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/98966639773.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/cjmp578i9jvm4u8mbh75t9338o/pixinubodulozunanodeverut.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/40976090250.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/lusamol.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/natixezogugufisokovunufog.pdfIn PDF document text
    • http://nature-revive.org/files/file/pedojupaporuxemujubis.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a08c0d77ca---87435030910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=medidas+de+tendencia+central+y+de+dispersi%C3%B3n+ejemplos+resueltosPDF 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_off000129b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B8 18852 bytes
SHA-256: 8601a9b57133cbeec7200b8e86b160235acb45f7a6e77563b6012164987caa9c
font_01_sfnt_off00015a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001725f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1725F 11152 bytes
SHA-256: 16b6497143c211642db64b67cf7a5a67550c8082a18c626921123650ac04667f

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