Malicious PDF — malware analysis report

Static analysis result for SHA-256 71450094655be57b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 03:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b7ec5e15cc241d954dd55283e172715 SHA-1: b5b95ffae22737f03dc4e4d103478d7f45f26cb5 SHA-256: 71450094655be57b019a25e729e6cf8b37cf9f7b67e86370adf6e762c57b7263
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, with multiple external URIs present. The document body is unreadable, but the presence of numerous URLs suggests a phishing or malware distribution attempt.

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://infrive.ru/uplcv?utm_term=kamali+from+nadukkaveri+ott PDF link annotation
    • http://generoussecurity.com/uploads/torexifipikepipatamiriwar.pdfIn PDF document text
    • http://standdominica.org/files/files/57058271358.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/wozaxerabomuvorufuxivama.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/62103998801.pdfIn PDF document text
    • http://onelove.cz/file/tepegitiw.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/jukovoxemifusozuwasuzi.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/zasasaxotitudix.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/51525226857.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/52583934946.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/44129942873.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/94699254432.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130d61a2722c---tegede.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/zavuperanafepura.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/57027443377.pdfIn PDF document text
    • http://cityfate.com/files/files/loredilife.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/lifugudasusug.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/73hd3od3vkqmmmtmg6hg6l124r/66894015673.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/nozeguradifilisirizu.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/15065578428.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec29a46c13---remusowirirelisuwekozuz.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/rawobapedapozupevuwar.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/31536820634.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/fopejijotaravoxakozaviri.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090506440671.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/fipurixuxasosivum.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_off0000d86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86A 17640 bytes
SHA-256: 050b3b1d727515b014b7675b735fb5dc8dcf38a3e11b1bb3979e941753c4966b
font_01_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 10596 bytes
SHA-256: 64a15ab2da07dc6041115fccc7bd96ea3d3a25cf6382f00d0b8e5607b21f48e7
font_02_sfnt_off00011e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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