Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc5d7c1fab1f1f2…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 05:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 725405e3e495277399ce5be05d7d65f9 SHA-1: 9e5ff5ea7b4f3524782ab4ced05e8dfa4245ae81 SHA-256: 5cc5d7c1fab1f1f26b517af1ac0d8e1d9d225066867fc33e0e17727f7d289247
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, several of which point to IP addresses or compromised CMS upload directories, indicating a phishing or redirection attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is used to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bosusivojefotiwixajugizak.pdf
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/lowujezoli.pdf
    • https://ikuseikyokai.jp/ckmedia/files/welimapobumifetefuwifiv.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kafuxazotekasetiw.pdf
    • https://ngonluathan.com/images/ckeditor/files/84864630829.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/7b54b81f7fe2b01f3a6fe084946dc0a5/17540631137.pdf
    • http://re-media.ru/foto/ck/files/70447535080.pdf
    • http://teormech.ru/teormech/usrimg/file/26356391840.pdf
    • https://avukatwebsitesi.kocgrafik.net/upload/files/28930115065.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/9016add01a18fd158461619e14d58cdd/57516286211.pdf
    • https://www.hkha.com.hk/ckfinder/userfiles/files/27816807156.pdf
    • http://ckud.handysociality.com/upload/files/vakoxafavimuzepixig.pdf
    • http://211.129.1.225/system/ckfinder/userfiles/files/jutaw.pdf
    • https://jagominum.com/contents/files/11385194699.pdf
    • http://hiro-seiko.com/upload/files/67119126234.pdf
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/80404710804.pdf
    • http://caythuocdangian.net/images/files/51696520806.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8f805e2dbc673e181bfd73143a41188e/tivudexiguderorovip.pdf
    • http://dienlanhtruongson.com/upload/files/tefivinepalilup.pdf
    • https://art-eria.pl/mandarynka/pliki/files/jilobikaxado.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/81627716278.pdf
    • http://news-hk.net/uploadfile/file///11550139445.pdf
    • https://dammesliepas.lv/ckfinder/userfiles/files/rewuvupijavejozadi.pdf
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/60394142538.pdf
    • http://maszyny.pl/userfiles/file/vosolokol.pdf
    • https://saunadlaciebie.pl/userfiles/file/givefavanit.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=wreck+it+ralph+online+movie
    • 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_off0000d876.bin
0c38cefe8c9f4fba8b07ea05f9866a21619a1f6a70394a37554a9512698a2537
pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 17480 bytes
font_01_sfnt_off00010505.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 16792 bytes
font_02_sfnt_off00011d1c.bin
62b95e61b34b8938dd45c83e18298b9fc87519837ca5e9eb09a65c61bed8ffee
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1C 10620 bytes