Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd52a42c808b489d…

MALICIOUS

PDF

86.7 KB Created: 2021-09-07 06:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a374f2512a6846ba8146054c16bdf25f SHA-1: 964819d4d7a691f6010582ef4fd647f655612993 SHA-256: bd52a42c808b489d584f08ee604f68cd3f34920140ad174a8a6f672d76bb116e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and URL patterns align with common tactics for distributing malicious content via seemingly innocuous documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://forumcutuca.com/ckfinder/userfiles/files/52340668205.pdf In PDF document text
    • http://career-id.org/ckfinder/userfiles/files/3696262780.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/j4mja35fb7ibqk59im6aj3va25/nugubuxafem.pdfIn PDF document text
    • https://proxus.nl/file/45067843824.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/tivetusuvupatefonam.pdfIn PDF document text
    • http://come2menorca.com/images/file/58060721269.pdfIn PDF document text
    • http://whatdwellswithin.com/file/raxewezabefigimopanutuxi.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/ginajavilozot.pdfIn PDF document text
    • https://ghnservizi.com/file/35022587255.pdfIn PDF document text
    • http://z500.si/files/71592540071.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/3f907c75c711ffc394ae200046d6fa28/73319237652.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/77734462723.pdfIn PDF document text
    • http://crystalcleanwindowsmn.com/clients/c/cc/cc5f591ab25ef7bbd7a205b431f39e57/File/962721900.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///pedinetixamewizitaboni.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/fedosaxivamuranotowiviguj.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/90808818273.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091afa36e776---fijopumisi.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd6455ce3---23693319155.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/71501263207.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/puzop.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/41484230697.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/vb1sjk7q2ek4484gpuqml43rt5/bimok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe0b7d2919d---mudisavawujoluposipejol.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba39fc333a---20735290492.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/55802025127.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160722010c3af5---79431128307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mfmailcomposeviewcontroller+attachment+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_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 11032 bytes
SHA-256: 442fa11a1644b486873d20b39bde8101513cbe505baa309d1ab84917b386fd41
font_01_sfnt_off000107be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BE 17404 bytes
SHA-256: 97849dccc693a2fbaf022b7f57715f290a488da99486a8e3bea3bb2a06c07ab3
font_02_sfnt_off0001349f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.