Malicious PDF — malware analysis report

Static analysis result for SHA-256 c409cd2014b6fe0b…

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 22:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da25d9df2090437df08de5202d9ca674 SHA-1: b429a2eec14eca41cc0cf16b83798a959539c622 SHA-256: c409cd2014b6fe0b2abe3923df4f803364c19b6808189911b7a371affdc36d4e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to conceal its true purpose, which is likely to exploit vulnerabilities or deliver further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://catamma.ru/uplcv?utm_term=challenger+deep+book+pdf PDF link annotation
    • http://ytbozhuo.com/upload/file/070022402745.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501152756145597.pdfIn PDF document text
    • http://nolimitscenter.be/peausitive/images/FCKeditor/file/manodasezarejegasupibabo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef42ec4722---pemuwom.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/645f80d5afd35ad9574e707fa414f046/losunegamujum.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/9004536940.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/74155526464.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/47914aa7a6fa3ac3a36d6a4166b16ae3/desikunuvipalozotuwo.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/48113787510.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/1fte9bro7uk9rofmhiubmobhh2/supefanafojodi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db610e30dac---gafazezefijekon.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8ed9e8bda---38003758164.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/v1df5aq1nv6drufnb0rr0047mm/45641134998.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/ludufilugefetafa.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/40427347337.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4ddece138caea49f3f165bcba96a3818/32889472602.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd36e312ea---25249313092.pdfIn PDF document text
    • http://web300k.com/upload/ck/files/97617215009.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e578df6c594---86370811850.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/8e103f5f45f1b65b53fba7b052271518/puleruzevizesavexoxevid.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/papizarutoziwadi.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/5305958985.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/95697523049.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/gusix.pdfIn PDF document text
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/putesonedu.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/wikaki.pdfIn PDF document text
    • 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_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 18104 bytes
SHA-256: c6592d758149f4865e2fee9eb9e0c67441b115b8d114d740619df37ac9a9e970
font_01_sfnt_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001350d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350D 10684 bytes
SHA-256: 88745e0f77721cc61f556c487c8cf1061def8546bfca0112f74ef27ce2e4838b

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