Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc38b6e8513951f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 02:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75076398d03cbea6faec2d42fad2c775 SHA-1: f328827b891dede57e886e3d1c40b856ef2b8a65 SHA-256: fcc38b6e8513951fa57e4a333e8ca2dd26bc71f409f0a9f3962fddab723ef48b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites that appear to be compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and the presence of multiple external links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hamzakocakoglu.com/userfiles/file/nixutowewizum.pdf In PDF document text
    • http://ohdiabo.net/images/ckeditor/files/nuzupatozewofagat.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210914014432.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/puzidu.pdfIn PDF document text
    • https://dhesient.com/media/kumin.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f0774e998---toxewolowawan.pdfIn PDF document text
    • http://szcftz.com/upload/wezebanovog.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/dezolonog.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/84693630989.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/sovikinefasomelemubi.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/mitizaninuzetexo.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/jofapoxejuvulu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7f5ba3300---51977719612.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/wezonujebubulosawir.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7eda2254a---36967247144.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/kigakukasemakamusezag.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/79686935898.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/dewusilobegimaka.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/93178994818.pdfIn PDF document text
    • http://acril.ru/ufiles/files/mizaj.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/71836587613.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210910_06B0A4FB3E0C059D.pdfIn PDF document text
    • https://icbacademy.com/upload/files/89471761047.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/92959987326.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/xejudunapagufojagibajam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mobile+to+pc+file+transfer+via+wifi+softwarePDF 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_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 17388 bytes
SHA-256: e4a1b3a0c54fd167f1e35e854948b12fdd9761251cf18f16e769dab9d8769272
font_02_sfnt_off00011e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E68 10760 bytes
SHA-256: b42f2ac3467105337dc555612bf9f952308e7410639dc9489deb1e3a5ea51e59

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