Malicious PDF — malware analysis report

Static analysis result for SHA-256 37002a3217302e92…

MALICIOUS

PDF

79.1 KB Created: 2021-09-02 09:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 677c25ce3dd850ea87832319457e8359 SHA-1: d6c86847da3ba17cce0a7f69c08db748f95cdd76 SHA-256: 37002a3217302e925029e895e74ece5b9e00a62b14d34cfe69ff712c2d890194
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://pnlestari.com/visitbali/image/files/dafosox.pdf In PDF document text
    • http://pedraferro.com/files/files/43445953915.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/jojubuzomu.pdfIn PDF document text
    • http://e-hematologica.com/users//file/dawopoz.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/42687730069.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc5b377e62---xoridajarumasolexifu.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56777215509.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/lezubuvumakixedu.pdfIn PDF document text
    • http://harrisonsfamilyreunion.com/clients/62911/File/datorozi.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/b88187bc0902b7b65854bca5a6cc22a4/43797204026.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/22923027584.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-08/15981346188.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cc1f4ac9c---tiruxanovawemumenufa.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/4956081258.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/lonik.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/gejalogepolov.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/kexopemuxajosivepol.pdfIn PDF document text
    • http://htwy.com/upload/file/69850647515.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/musabatasejapujevetixexa.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4a8384651afea7bec204856c4a643e53/gadawodekizi.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/e0g50ubokfge46dj5kk6jveklk/tisupeji.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/0muo70r59n95bvq9qehoqf30kl/sovusepu.pdfIn PDF document text
    • https://servicepapik.ro/files/bawafadoturuse.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/2395045466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+watch+super+bowl+2020+without+cablePDF 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_off0000cf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF49 10924 bytes
SHA-256: 5dfcec60dd5c2178485bdd7b076682d62f24c079870bd1da75d6317c7afb5217
font_01_sfnt_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 17520 bytes
SHA-256: f9b91faac19cc3abb0a17f5add70459fdabaa9059509b4d12ee1de6093e8d99c
font_02_sfnt_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1