Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60fd593d6690e14…

MALICIOUS

PDF

76.8 KB Created: 2021-10-06 16:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4403e7fb573cb5543ade5c74204551f1 SHA-1: bf0586aa26a2d9deba3c2d0ca1ccaabad655cab8 SHA-256: c60fd593d6690e14ec6f72232d10a779ebd5c4585fd956221db8765598e1cbad
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to compromised websites, indicating a phishing or malicious redirection scheme. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a link farm designed to distribute malware or lead users to phishing sites. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://inwebjor.ru/uplcv?utm_term=pv+and+thermal+solar+panels PDF link annotation
    • http://centromedicoveterinarioadda.com/userfiles/files/nojesudesapixeritekubet.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161516c5d95862---faxofenukulixowavesetab.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401b2189688---19041199299.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/21320522467.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/20117760953.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/79540330181.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/dalusuvigolig.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1615baababfee5---340979293.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/xomilufiriratozefusixeve.pdfIn PDF document text
    • https://greenways.at/userfiles/file/62312243662.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71723133574.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b0beb1adc7---17517844380.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/62363635899.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/mejerowaxopadizanukupib.pdfIn PDF document text
    • http://dsagco.com/Upload/file/69524902802.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/76881605342.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e398f239---pexodazafasosivarobezezib.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/13382471781.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/14406250081.pdfIn PDF document text
    • http://indexone.ru/upload/file/lowiputuwozudoxokevikom.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/rigibewagamef.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/30056153923.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///nexemaziw.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/judizu.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452e1aa9e4c---28486840926.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161540d68a9aa7---zijuxivir.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/42687901938.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_off0000c901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC901 17264 bytes
SHA-256: 7cfaaf7bc9e4bf2a1d1d168a1f6deca2c0486c6c76a3365a46218b9a29bedcff
font_01_sfnt_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 10632 bytes
SHA-256: 122880f9ec9a10aabc998f8b03abbaa07e92c2565727eaef337977aeec7ea318
font_02_sfnt_off00010d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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