Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5758b5acac49ff…

MALICIOUS

PDF

91.5 KB Created: 2021-09-23 03:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c721fd6f62dd5573526805a3c44dda0 SHA-1: cf862790ae0c2a70229c9df28fff6960520f467a SHA-256: ce5758b5acac49ff99d1b87bc4d0daabf7888386d96a26e3b1d5f8156bd06fd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://coretry.ru/uplcv?utm_term=how+do+i+connect+wii+to+internet
    • https://jurvamartin.com/userfiles/file/43167301993.pdf
    • http://westhollywood.ilovepokebar.com/uploads/files/43148112186.pdf
    • http://tecnoservizi.com/userfiles/files/44195202889.pdf
    • https://sharmtocairo.com/userfiles/files/11790304813.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b531e90ca3---5569033875.pdf
    • http://lapawan15.com/shop/fck_file/file/34850254499.pdf
    • http://unipsyclinic.com/userfiles/file/20210911122440.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bacfdb52c2---8753200829.pdf
    • http://shannonlakeestates.org/fck_images/file/61114014272.pdf
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/zesejakobigukafodupifode.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8002fa946ef6ee6853d218ae9b5e5f25/53000249778.pdf
    • https://lawrenceyezersky.com/userfiles/file/19487648547.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146b5f3745a9---doxositonozosojoridovedu.pdf
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/bomafuripurexunuwevus.pdf
    • http://wixoon.hu/upload/file/poridozewoxunevopo.pdf
    • http://parfumland.sk/upl/jafosuborevenar.pdf
    • http://rabwork.com/media/file/71931625855.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/92a734f9c61a017eeb8e624a0d172872/kegibadudujeperalejeb.pdf
    • http://a-b-i-s.net/layout/bilder/file/89399644809.pdf
    • https://digiconelectronics.com/media/90639865060.pdf
    • https://coffeetuanvang.com/Images_upload/files/90356414159.pdf
    • http://iseveranscopy.com/upload/editor/file/wulabe.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/e5kv96npdsi19rjqst9v0vc9n6/5840840957.pdf
    • https://grafconsulting.pl/Upload/file/xomix.pdf
    • https://drgcode.managenet.ro/images/file/fulazuwokedejuserojik.pdf
    • 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_off000103a4.bin
00f816d67827df9dd190bfc04ef55dce37d5b65706d925a86b2ca7ede5b75964
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 17832 bytes
font_01_sfnt_off000131bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131BB 16792 bytes
font_02_sfnt_off000149d2.bin
97693a0bf1dba516bfe40d4f708809e4f91371c4f7bb1c4955cfcfd5f1509cf7
pdf-font-stream PDF embedded font (sfnt) at offset 0x149D2 10064 bytes