Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d54f4c4e09e920d…

MALICIOUS

PDF

87.6 KB Created: 2021-09-01 01:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d0fe720a38ae73be6bc5e6153ebc1867 SHA-1: 30312c6230f77bc788e0620b9d4074068758a83b SHA-256: 8d54f4c4e09e920df4d500098203ef279e826d6ac2959e886df984f19d1f511a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/34f9a339671b62036b5a2c6886d9741b/buwipakomilowisunete.pdf In PDF document text
    • http://okzawidow.pl/img/upload/files/98746749240.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/7efba832d55a77aa30f7a7bc05a1004d/87594827221.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/55837492277.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/manof.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/21f6b091be795209abe5f05ce8efdea1/19778964797.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/221729ea018dd2daa32a97cd6b459c20/malom.pdfIn PDF document text
    • https://wsbtitan.com/images/file/17994177992.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ca9987412b9787f80d092ff5a59e46f4/27438644808.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee403007f3d---renapimidofupekebesa.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/6nlvaiv44j65j9v7on3cep36tv/91110467270.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/34425128814.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/bogodedaxisaraponupobop.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eb6381a842---rirekejeduv.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/27fafdf81903f5344a737871b9221ac6/49834386845.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210514212908163.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/42137478312.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/23793622174.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/uvipmb5qk2g8ldpu9vklkv6rc2/pamotazixobep.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/pibafi.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/rokibuzojefogutepok.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081c1816a9f3---91504247220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+boy+in+the+striped+pajamas+chapter+8PDF 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_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 19672 bytes
SHA-256: 694e3dda3ad54da3c31612a1cd6e2d0b20d98d1997f35b6bd4eb081e111440d0
font_01_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A5 11288 bytes
SHA-256: 15d7484485599c1abe9bba11b948ae42d8c39c6aa456ad14ba31fa54f44f6085

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