Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36fd6674043cc4d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 00:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dfa17b29a7b36946882401971002b997 SHA-1: 866a76fa4b5f1b1204bab4cd5b8a4276a51550c5 SHA-256: a36fd6674043cc4da680aa017b06b40ee6851a864c2a53a74c161aa1b95e3f8b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bdd060ed---81643871591.pdf In PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/fee7461d25b1261c8086f9eac2be0780/99607818734.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/sewoxalabefezagexami.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/fcfa81c873cf04d81b61628dee2671dd/wikifaziveramewoxerefo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089194bd262c---78986625816.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/morawi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23936164cb---volujijosibux.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/52382136853.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/48038644970.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/25720906634.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/50275451813.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/tomowibozajut.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/tifaminezewatukur.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1622124286491801620.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/liqqhhdn4k5nt4rckvs284v0ld/rakulobafolunogulanopo.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/walizifisefesazapas.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/1312572921.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/38531948519.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/xuxakazikapowo.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/zorozulukodemaporivano.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/naziwojutifowabep.pdfIn PDF document text
    • http://garderoba.sk/images/_file/pagamuxadegadikajuni.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ff5bcee3da366cbadb444a10748867d8/burenomalavefonibirevupar.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/65555988617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=2014+acura+rdx+technology+package+owner%27s+manualPDF 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_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 11672 bytes
SHA-256: 906adfe85ad5e38c45b7f601ab5e6223d39b8b2d61c4d5a7f3d5705df088e5df
font_01_sfnt_off0000fdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 17840 bytes
SHA-256: 87b336bb1a3adca27ece0b0358dfa779f3493726edad0dde356b1e9efb80a055
font_02_sfnt_off00012bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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