Malicious PDF — malware analysis report

Static analysis result for SHA-256 5316106cc60e224f…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 00:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f636534008b5c9b1547b9c18ead8e6e3 SHA-1: a306eb810df098cc4cc2b8943a346b3823883e04 SHA-256: 5316106cc60e224f458b7ba87273d63094da436deb21e08b7b2e870809ab9b68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://music-summer-courses.eu/upload/files/birateginuwigekogekedisux.pdf In PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210921093304.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/xegirunojalugopusesox.pdfIn PDF document text
    • https://brs.jo/userfiles/files/21843756842.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021091718524173499.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/loziwilivosakufu.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/82934589104.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416aa6062e3---56045710455.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/66096755563.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8c596db07ef731d75e35fe6007e2789/69502321493.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/gejorarawukanukam.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/jupinana.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/79310540538.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/88462654960.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/fudibidavidizewidekare.pdfIn PDF document text
    • http://pasted-radio.de/web/files/99267570494.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/128a01309c5beddea3da0a52049f1072/7056459378.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/wiribudizosubedano.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/46092018955.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/sakamogeparorawozawilubuk.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/numexupidukurirokegak.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/66117477417.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/makaguzojosesumuxebarekig.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/wonirusozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hoga+toga+dictionaryPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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_off0000b1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EB 17096 bytes
SHA-256: b9632b877e2876a3298f08554b2cd506c4184227ae24b51c53d31c31f7812f6d
font_02_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 10304 bytes
SHA-256: 118f5fe9122f43c6dd70e50727a1462f5a95b4dd6a736b2af78f158a4e85ace1