Malicious PDF — malware analysis report

Static analysis result for SHA-256 35de55a67284a22c…

MALICIOUS

PDF

85.7 KB Created: 2021-06-27 20:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3d23b57723d79af3e76894e6c0587d9 SHA-1: b8ba5b38123e689d15a40b136e7af88b1b90d816 SHA-256: 35de55a67284a22cc989fd31b3da0531db7980887e7c9b6e388198e00a22a6a9
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of link farms on compromised infrastructure is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/f45bbb89a08444d0c5dfb7f38813c624/75988023356.pdf
    • http://sushi-belovo.ru/files/besosusunudabapenexuj.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb6e282560---pinagazewotu.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/004309b70cae555ab356d07265b7484d/78910669622.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105061758587630.pdf
    • http://armanetti.com/images/5383043903.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609428a6aab92---gagaxenatej.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/jobtmq38u4q62vqdvdiqk801o6/11705286130.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987875171d8---34439029794.pdf
    • https://bem-sa.com/img/file/razejesamajivarivosaje.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917c3b9350c---rilodewemeropodusomolo.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/2588734432.pdf
    • http://lumieretvie.com/userfiles/file/24190060769.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f12f49e279---zopolekegigeke.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/nkgdvkdlvfeq48u0t2pmpr5r55/81366287307.pdf
    • http://allycatering.com/userfiles/xaregonakaf.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb81fb7b5e---zukukumewetukosewedasi.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fvd6a8ntrkn3j8l5i5ll99qv43/zikijo.pdf
    • https://eseninternational.com/uploads/files/medevolejarokoso.pdf
    • http://scamps.biz/userfiles/file/xuxesilefata.pdf
    • http://praconsulgroup.ru/pict/file/39647968177.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d014527608---56781087486.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/79ae531ef5f369a9bbd3bb0a63381e7b/rodibuwufodelenafajuleni.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/137b8f0154665a2dcdedc9d88746606f/88388702731.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb3c099c9---mubefotipuwoborivejeru.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=as+your+wish
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee18.bin
29afe151da3bb11fabcae3f7cbf5248c0124614d2a1d57578403c974ba75b9f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 17496 bytes
font_01_sfnt_off00011b9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9B 16792 bytes
font_02_sfnt_off000133b1.bin
82f55365085a8d6f072d5776e41b000dff12c69b90b531fb4601a1ef9906bf65
pdf-font-stream PDF embedded font (sfnt) at offset 0x133B1 9944 bytes