Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc8b2047cbd5e29…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 14:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6dbe1f39cc1fcb8f2300fb5e95794606 SHA-1: de00b52aa1fe07b846dfe6f3e31c5941bd34919c SHA-256: 3fc8b2047cbd5e2953d86aa947e3530d609e783cb5fc9ecbbd31286be9c073ff
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous disposable domains and compromised CMS uploads, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are consistent with a tactic to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://gagiongvitgiong.com/ckfinder/userfiles/files/3822359440.pdf In PDF document text
    • http://rheumatology.institute/upload/content/file/gevotojumasuwimewaxatod.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16071f518a1b65---61382712791.pdfIn PDF document text
    • http://abpaluso.com/upload/file/85025523505.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160729c89ca18c---zibevirudemovubu.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/478750037.pdfIn PDF document text
    • https://palet-school.com/files/files/xenujivosakugew.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/47101085384.pdfIn PDF document text
    • https://elektrona.cz/files/file/39813735802.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/fazifatofigifijakapedituk.pdfIn PDF document text
    • http://hanleyresources.com/images/vokudomo.pdfIn PDF document text
    • https://music-group-store.com/upload/files/10657162465.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210830111015198.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/5996662100.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/77181239680.pdfIn PDF document text
    • http://gazetavk.ru/img/file/fokamugakirewuwale.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/kunimepogolasetunugixax.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2f712158---28666690878.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/18299201086.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/zabaxubogumuv.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/463d7ba0425edc090b2dbbb21c17f2f1/76629758909.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/85446190854.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/nikakamebugusuniwu.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/fapetifigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+the+grinch+stole+christmas+worksheets+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_off0000d403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 11236 bytes
SHA-256: 95fa2d0c9648c0e5f441cf03c35a1ee3f938ad6f4667bd22cce858c2c98c1768
font_02_sfnt_off0001060f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060F 18004 bytes
SHA-256: 9d00bead8f2438803be1830d4ca7fdb6910148e145245f59755dbdafa0dff685