Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f86168b7ba6457…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 12:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8728437424cd1651f996722ef4003c16 SHA-1: 25a5f6434e9b9d54c3dcca4a2e46b41a17b378b6 SHA-256: 80f86168b7ba6457a20fe6c98e34e9ca4efdd7fb1ce313f5105056699489fc5d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious link distribution mechanism.

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://huntic.ru/uplcv?utm_term=complete+irregular+verb+list+english+pdf PDF link annotation
    • http://ahcxdq.com/uploads/file/310758531314.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609c061df07e7---8284992888.pdfIn PDF document text
    • http://lactopad.com/uploads/files/9045821826.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/64693099734.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/akl6bmbjpe9qd8nbhf79st54er/zugebabibami.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/nuvuzuxevutabirunasutaw.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/doluromuwutan.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/51236250478.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/fozojagefarexusanasiguv.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/9a1691115f460921e3aca2262b978969/25817681249.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/5139425664.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a302b3af2---pobizumelibomeguvu.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef6c1dc08---sunujasolorujona.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16105e255510fc---70158410649.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/zelipamifususowukakinu.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4d10918c8f3b057e42be8864ae36f73c/tafokofexekumakeliz.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/14829532359.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/mipudutiwinesadi.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/67641064567.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/xapowak.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c2e432a2122b7e5255fad1b8071ad00c/58209403617.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087f5296be77---79944541568.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f614b47592---jomaluzenofugoxovebima.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1630093066886817136.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_off0000ce4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4C 18272 bytes
SHA-256: 638cdfee2f5e8cd19fccd25777869a06f430dc0d7e57b9f7ad7116267bf60f5e
font_01_sfnt_off0000fd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5E 11280 bytes
SHA-256: bc1f116b477d44a9913173169b4d8d8c781cd7619f84ee4db33d7678f88eb6da
font_02_sfnt_off00011738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1