Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d2c3653e252dbe…

MALICIOUS

PDF

94.8 KB Created: 2021-05-24 14:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: aac371c650520aaa65fc78e46cce4323 SHA-1: 13e548be45a5a5d4112798167e709ae227fdfa23 SHA-256: 16d2c3653e252dbe26463a45f1fe722bb8749849324c4774d3fd4c4a8fa37361
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/aa6aadaaeb6317260c747334acc25229/40807312552.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/535665e9da491a59818590463b8f38ed/18490179277.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a429ed833f2---46827595138.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/lakepodosuxoli.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e409b0b8a960da76873092eca8109c88/sesubu.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846d803750f---muxolomerozobigemi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed79f770ee---6199715910.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad4825d4e6---11828934466.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/lilatorusifufesimew.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdba52578d---91244640929.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/woxoliluwudum.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/7c08167fa9263b059d85e5cb979d8668/pogeritilegonadolisaveku.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/zoxinulumulifemoberukulo.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/20dd30e036d3439cedf2f235b443bdcd/zigorelawopipurexodidulus.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ihu1fdes06pcvduqr56vm9c2v/84270895366.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/figifexinirubutewe.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/dolaziwevoguzuzibil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=kabir+singh+tujhe+kitna+chahne+lagePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8C 3712 bytes
SHA-256: b4594f198852b8c5d1b837bca190b0363ffb5c8cb428257f21d934335f75acd3
font_01_sfnt_off000127c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C0 5312 bytes
SHA-256: 26e60b2287bfaf8a46b5b6987ae798e43fb419ee97ee3663087da0ecb908000f
font_02_sfnt_off000139cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CF 10668 bytes
SHA-256: 7285b75341fa53cf359f17c91c167801ab0f9a152511c54ec0227304084d7322
font_03_sfnt_off00015ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA7 4488 bytes
SHA-256: 669f4b7e50cadc12e51ef4ba8cc1a7bca728a9920a91eee43287392d36cb9a70

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