Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e030869c46833c…

MALICIOUS

PDF

117.2 KB Created: 2021-09-02 22:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02cce89abbaaff0784f91c2f7c96d382 SHA-1: bf1857946f239fdfddc63824da9593d40a429c72 SHA-256: 35e030869c46833c88dbe3195ae37ed26abb38830515fc9010d2cd87db89c8a2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating a link farm hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware-hosting sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://makesomenoise.hu/upload/file/75692660631.pdf In PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/33230697738.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-2/20210502025822978386.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2f9eeaf02e27d94f3ce001597792a27/xodidew.pdfIn PDF document text
    • https://irantruck.ir/data/file/zanas.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/91098101057.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/acd0c06a6c46151f41ce5de579711858/55532533397.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/14563813152.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072db2192f4f---664339177.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wutikapage.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/r63j3f5rvs6u7a66mvihhfl3ar/93667341146.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c81fa6fe00---56829985100.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/6cf1330e49440934cf753bb58b9cd647/68914899414.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/j19q73mluh37bh7hov0v7thhgn/josoxutebax.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ace247497---zagevad.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/72070272412.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aad0880682f---lawilofotadasokigosaturex.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/78569388382.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/31524760213.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4a632274a---20682136735.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/60053468111.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/tinixuj.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/57788070910.pdfIn PDF document text
    • https://digireg.org/upload/10232605298.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/1g6lmgqvqp0dubhi44e512q5jt/56542065657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=prussianismo+e+socialismo+pdfPDF link annotation
    • 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_off00015d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D1A 22340 bytes
SHA-256: 6dda947211dca94434e6406c2a9172bda56d0a33b7c00240da1ba910bc6ac856
font_01_sfnt_off0001961d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1961D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ae34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE34 10784 bytes
SHA-256: 17024d291c3997b4ffad6cb196a37a4cca9c511586e8637d2bd8febf2ab9d56e

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