Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13f447db71a80ea…

MALICIOUS

PDF

78.3 KB Created: 2021-08-30 13:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 35ed8c7e0cbd6b7b1c5dc649bedd8a6c SHA-1: 40ecb38d1e4a46c6659038d2d2e65f3027b199dd SHA-256: c13f447db71a80ea6e84125fdaec0c5bb3ac9826b88c71c49cc187fc0d754ab9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. The primary purpose appears to be directing users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5079

Heuristics 5

  • 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
  • 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 http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079066220b53---93228527491.pdf In PDF document text
    • https://nhahangthanghuong.com/uploads/files/17554528716.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/9q3gmcnf9qpf3skroi68231gl5/84134232589.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/45613640036.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/1639831025.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/18680392995.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/luxetobasolenodudujidez.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/96370009700.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/22134593779.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/82953023644.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/lereve.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/zinokuxigagenolerakut.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/5038256c6789d46edd4c4077e5aa786d/molaxuf.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/gileloledawaxafetibo.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/jozemiz.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/82ee47849f674f78825d2c66f04e5340/kapomeguwi.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/13744654369.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/7799721673.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9c48d5f6d---zetimalevebodezuge.pdfIn PDF document text
    • http://esistore.be/userfiles/file/7730916894.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0e97e48bb6fc979f6388d4fe36fbb5c8/34750368522.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/pasaposejojive.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/wubineva.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881a4eba8d8---46556578799.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/razexurijevilajelanusikew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=get+a+suit+tailored+near+mePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 19692 bytes
SHA-256: c01d5efcf84d1ed6915dc71e6f6ab243ac1db120d6d9b4bec417976d770696c8
font_01_sfnt_off00011374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 10548 bytes
SHA-256: 58f514f2779976a1ae96d91406b1babd034bbbd467eb21a74cba4a628a959d7c