Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0175395fee54b2…

MALICIOUS

PDF

81.6 KB Created: 2021-08-07 07:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fd5cc251052737a1f6f1322afcc6cb8e SHA-1: 5bc6bac74646e58563ffcda28ba4878632542a25 SHA-256: 6e0175395fee54b2f158a89259e4d5511e936e98b39a14a304a18c6d1abe2a75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised WordPress sites and potentially disposable hosting domains, likely to facilitate the download of further malicious content. The presence of multiple external URIs and the 'SEO Disposable Link Farm' heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=fifty+shades+of+grey+part+3+full+movie+download+filmywap PDF link annotation
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f88f627784dcc037bb32de443eb5c69d/18186419608.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f297bbbb10---vukaponurot.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085210a5c765---foxeraxipokefutami.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a44bbb6caaa---pebofisojeji.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079d24d3932e---biludizalogidin.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/23799437622.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/63963120093.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/loreruledagaruxa.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d98a73a7a8---25982513282.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/54751013199.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/18517844206.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/pawusurusudume.pdfIn PDF document text
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/heg154e2mlfu01i01bht8cct6e/kuval.pdfIn PDF document text
    • http://cl-pub.com/files/files/59794260659.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160771c15014d6---fuwemorukipiku.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/xivuwilovi.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/binabidofuduvuvuva.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/77482244394.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/11108497534.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed76cc4789---mulosejizegixovadeg.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da08d981e37---78585647669.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9057f1041---4279868462.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080245a51f91---tarafekafek.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/jmsvc3uj24qo1pfnqjgijd2o0e/xenezarogevawava.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/iev63j099fv9uhhui8mdpj3ve3/mivurudoxezusa.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_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 11460 bytes
SHA-256: 7176e18e92a7a99c1c6dbd6d8e89e5d46078ea41b712585f71cbbcdc23818988
font_01_sfnt_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 18156 bytes
SHA-256: 1d02509a034872fbf4585e971efb641814dc01608f27ee3361e70680361e8496
font_02_sfnt_off000120bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1