Malicious PDF — malware analysis report

Static analysis result for SHA-256 37dfe6c07c038bfb…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 06:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d40e39b7c0e3e5babb1638c98bc01f9c SHA-1: 0d2a902d94ee34de66d71bebba2832e1b8b66e8b SHA-256: 37dfe6c07c038bfb80d836585330edecdc433bdec85d78a37b82f35002d71a27
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, suggesting an attempt to redirect users to download further malicious content. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically indicates a link farm hosted on compromised upload storage, reinforcing the malicious intent. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://futurepoolandspa.com/ckfinder/userfiles/files/fividivavasetovajulal.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614298118901b---wuzisedidu.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137623bc3b5f---kebuwapenalonu.pdf
    • https://semot.com/Store/userfiles/file/taputato.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/54296694725.pdf
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/73057744461.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131cd3316607---kipebuxotimoju.pdf
    • http://nuk-amro.de/userfiles/file/86472851334.pdf
    • https://thibiditrading.com/public/userupload/files/rinaxalipili.pdf
    • https://casaalu.com/luutru/files/talepituzavafejuto.pdf
    • http://rococosofa.com/files/files/zakafoposo.pdf
    • https://spa-salon.ru/ckfinder/userfiles/files/gemumifulikuboxobudixowed.pdf
    • http://novo-foto.ru/ckfinder/userfiles/files/dopuwufilaterebafe.pdf
    • https://keralatemples.info/ckfinder/userfiles/files/24380185791.pdf
    • https://ka-base.no/images_content/file/ledajugotizabisaxapiju.pdf
    • http://hflbdq.com/uploads/file/130535402537.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/foponogabari.pdf
    • http://watch62.ru/files/files/zezobixobunojakovejad.pdf
    • https://istanajp2.com/contents/files/87095116971.pdf
    • http://hocomesun.com/upload/ferokasiluvew.pdf
    • http://bunny888.com/ckfinder/userfiles/files/49425017336.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161389baf09f4e---jubudavezegodugivuwejuma.pdf
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/7438854602.pdf
    • https://arhometutor.com/userfiles/file/jidevisud.pdf
    • https://ashasuchikala.com/ckfinder/userfiles/files/66295554151.pdf
    • http://altelaw.com/uploads/image/file/luzufekevuz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=2021+movies+torrent+magnet
    • 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_off0000e585.bin
68528bc67e0d7279e8631a3616eefc4880d3994aea70d95aa9534dd10db84399
pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 16700 bytes
font_01_sfnt_off00011103.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11103 16792 bytes
font_02_sfnt_off0001291a.bin
73d918274fd7081161ac6ddb37cbf13916c7b39aa3c69e640ad3dd3e0d9ebfa1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1291A 10668 bytes