Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc62e92c125f0fb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 03:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6603e33d224254e633c824905d7d6280 SHA-1: b34d30261391a9d3347122f8a18fdd28b4004769 SHA-256: 3fc62e92c125f0fb0ac35a3ed80f21191b7e83ebd93dd800585fdf6cfdc51967
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document's structure and URL patterns are consistent with a malicious PDF used to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://philabc.ru/uplcv?utm_term=free+ott+apk PDF link annotation
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/dusudoxulofixirugegid.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/68619817033.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd1fb35fa5---bovuditapikajunonezexak.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/geninadokonisemelis.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/27737740277.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/89246279623.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/vinajajolelulux.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/bapixilebetaxixavewofin.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/6579634011.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/noxutisutexo.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/32819249922.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614364da888d7---7417117836.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/musapeso.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/a794f0cdcc17b391a096037211a2be3a/47155599219.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/lijevujebalovokubaz.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/69325874853.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/17022281979.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/23710894706.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/922736834598125c03d8b575a15ac14f/48421693524.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/70838518738.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/panilujimevoxuro.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/93924731506.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/11490680731.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/bifujupasofadulesezedim.pdfIn PDF document text
    • 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_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 9904 bytes
SHA-256: 20b65a58b0686b20cb099c4f5346dc3e76ef85cbeda96a51b1464fed76ed1616
font_02_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 18388 bytes
SHA-256: 924ec9088c02bbfb2bb84901a0fc96088bd803452d4e2edb48a7f88eb3e3ccc3