Malicious PDF — malware analysis report

Static analysis result for SHA-256 69e36bdb7443ef15…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 00:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5506b6801c4c0ab7b816c1db7565880f SHA-1: 385a7e86b8e6ed55d27f0d797529eeac57cf107f SHA-256: 69e36bdb7443ef15fe90f59d6d89ec3930cdb97fdc2c62844722d49e500a872f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4bjqg3uj5e5fc1tprn6ml2cnl1/93509122882.pdf In PDF document text
    • https://bulgariapools.com/contents/files/70817217516.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/wadezadizowikiweli.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aab4330c740---xewedinunavakubo.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/rexefurugokozabowivo.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/15621037995.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29de10f667---baxibose.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/10747092921.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/wopamivonamovetad.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/wibir.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/61149976902.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/b27qqdcchqm34vs7fbebrqappn/6234501622.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610007b163318---zakilum.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/vupiku.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/de7943d32183a5f3f7cec6b7ae161e16/97189635771.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/80970026290.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/b6d48vs86etlkomdk14086u32e/sonudexu.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bexazotekutujev.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161198d6349146---vekap.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/d51bdd67774fbc1d4098ef4dca3307e0/19255473847.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/1309889449.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/39796533151.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/75530439705.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/82750679224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+pronounce+influencePDF 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_off0000b954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16B 10320 bytes
SHA-256: a9f4093aae0d377757f7d69c54e63eb59a6d2b0953013f51d304fea9ba178e8e
font_02_sfnt_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 20120 bytes
SHA-256: 1a89a55944044f9a86fbeca28d3a7298965c58642e865444c7fd910916617abb