Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced76719d6f4c36b…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 00:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 885b6671b850dcc1242ba29813f20343 SHA-1: cec06d69e1f39bc1b2ec241c1cb6a4a3c6432163 SHA-256: ced76719d6f4c36b401739ab0c8579f37b66bb84dd336ee693b63bafef67f168
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://szao-spb.ru/images/news/file/sobexewa.pdf
    • https://k-newsletter.com/ckupload/files/39032064161.pdf
    • http://cn-junsheng.com/upload/file///2021622195693684.pdf
    • http://faradbox.pl/files/file/85130273665.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd75422c30---11132345285.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/tapusovaxato.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/pb50gp6f1p4fssu3rtkjfmtn66/pulotakudijer.pdf
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/54983339997.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/2288a4af9781d826787dcc68cc364172/68848031188.pdf
    • https://advance-pack.com/editor_upload/file/bufulaziwenib.pdf
    • https://bushregenerators.biz/userfiles/files/51550106549.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/4a4877bd892021f840448b6faeb025d9/giwopijifarojitelokex.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a7bf6a192---57152362528.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24671c5031---26625264319.pdf
    • https://alixdemassy.fr/userfiles/file/tofejipenutumemisubexav.pdf
    • https://alakharia.com/public_html/userfiles/file/wobuxifejoluzenanubitinuv.pdf
    • http://sbox-technology.com/upload/datoteke/73552168748.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba59e2818---25198829425.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a8a8131f5---66930123166.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9a5f2e6f3---kuvegifivufojonowaz.pdf
    • https://noriupapildu.lt/ckfinder/userfiles/files/vitizolowogu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bollywood+movies+2020+online+free
    • http://irodori.kir.jp/files/file/58187663801.pdf
    • 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_off0000eb7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 16792 bytes
font_01_sfnt_off0001038e.bin
1e034f063c95818e360138c17482a79b315704cad06bb05c11e14d06b2e0e91b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 17320 bytes
font_02_sfnt_off00013113.bin
dc3c2d5e03f2deb355aa37618584771e343797885b41a0c32067bfb041c7d987
pdf-font-stream PDF embedded font (sfnt) at offset 0x13113 10816 bytes