Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa761cad6a9e5d41…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 13:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: acae687bb18c01cd71e098b1fe8ae31f SHA-1: ff2ff3fca42cd2c5daa4e1c1925669810028aeca SHA-256: fa761cad6a9e5d41cd16e1809d3b811462f64e6bdb5caf21e3a9df115a675b1e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=saturated+and+unsaturated+fats PDF link annotation
    • http://partnercable.hu/files/dezorimuw.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/kibizutajipojizus.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/499954006.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/79088479897.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/xagavawomokizaxa.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/vavesurotenelipuwotu.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/84942102142.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/42590196789.pdfIn PDF document text
    • http://airmon.hu/images/files/mibewegadavewajigopu.pdfIn PDF document text
    • http://e-district.org/userfiles/file/84702556026.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/sezorepewi.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/mukutowunoxufadif.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/nifegalipifirupolabimigu.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161486d6853a15---navituninag.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/b87762d82e75b15d7bc7f1452defd575/62482109585.pdfIn PDF document text
    • http://kurtoglumob.com/upload/file/rotamafasokizodulibapotur.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/titesolozamokutita.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/60508936294.pdfIn PDF document text
    • https://hklh.vip/data/attachment/file/81157501962.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/ramujinukagivexanuvavoz.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/24505585243.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161324e57df737---41935117811.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/vadubenovaterumafek.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/tixejibiw.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_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 10264 bytes
SHA-256: e56f50a78cd3a4933e209c9f47c91b3bea7643d2b63a902e0a7c7116b28af10b
font_01_sfnt_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 17548 bytes
SHA-256: ad9bbff0cfa2ecea61e507ff2bd522afc7815e794b66d343edb2daaa85476503