Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49f3b156210064a…

MALICIOUS

PDF

71.9 KB Created: 2021-07-09 11:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e6305b30becf30369596ae0ab546649 SHA-1: bc2843a49562aa45efae98c606bd451731ed49e0 SHA-256: f49f3b156210064aa02451b46ded7095b1adba53cf8bb5b6010b639dd1c61fe7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites, likely to distribute further malware or conduct phishing. The presence of numerous external URIs and link farm heuristics strongly suggests this is a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://poornasreehomeoclinic.com/ckfinder/userfiles/files/75982065795.pdf
    • http://china-baby-clothes.com/d/files/sogoruwevaforapabijubi.pdf
    • http://expresskaliski.info/file/99264988441.pdf
    • http://resetimpianti.it/reset/public/file/62662177967.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/f270bf444755dfc8fc1a2541e94d652d/noxabozomupaxup.pdf
    • http://msinziniering.com/userfiles/file/wupujafe.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/1389003ee2733864cf4eb0d94bb2689d/86575167176.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3340472e0d---tikawekibabatuvelazumeri.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/96877233834.pdf
    • http://afghansolar.com/userfiles/file/79332207713.pdf
    • http://gdlianyu.com/uploadfiles/file/64352731184.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3134ad84---widibofejajakul.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/961cec6de9fd1adb52d6bf15c5b5d478/16248443247.pdf
    • http://erdbau-rauch.at/burukisarizu.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/d3ef71c2dcf046e756af33260e793b9a/naxeligokikimonalexunutam.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/off601kbn29ngp1odhmrhnmbfo/15319211600.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/bf695444e0ca9db53b6dc75a0ecacfe9/70456147817.pdf
    • https://businesslife.com/content/file/45260415138.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a714f6ba0f---39552997968.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d8a507fd7---bofejividapefuxa.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f7a3a4dccb70d7727e5392201d50e076/91857995952.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078d75d5b269---dibivivixikofavuritiwapil.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086053be880a---ruxukokegoxoxizunefe.pdf
    • http://www.victoriousintl.com/new/resource/files/jikuwipatude.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lukas+graham+7+years+old
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba75.bin
72c6d7b1d2677eda6ca8c85a41232f102b08182eee99490bc5bf5c80e9a1df5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA75 15468 bytes
font_01_sfnt_off0000e1ab.bin
970c465b36a391127a243081ba322acd04ca1ff34b38426dfac1b18c8408c1de
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 10712 bytes
font_02_sfnt_off0000fa24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 16792 bytes