Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d93a37695d60dd2…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 13:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a9e9887411227c702eaef38cbcf5989 SHA-1: 48c58676703b8ff5d0231e97802195d115012e55 SHA-256: 3d93a37695d60dd2ca4c6e5ddc3cfbf0c271f0cf97ee7baef8f15fd1ca69d21f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm. Several heuristics indicate that these links are directed towards compromised CMS upload storage and disposable hosting, suggesting a malicious intent to distribute further payloads or conduct phishing. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bigxra.com/uploadfile/file/2021051508254573499.pdf In PDF document text
    • http://cc-loges.com/uploads/file/zaxinuxeroruvudobakijixo.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/jipupovujovuzudimutadug.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/kivevibivegefujeb.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/13858512056.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/xufitotu.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d560f333c---66212020561.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/87549820992.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/37195175572.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/gapomasujugiliwajaforag.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/wezosisaf.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d4a52aada6---jogal.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/61887497946.pdfIn PDF document text
    • http://honda-vo.com/upload/file/suzetojoruxowu.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/vowerutaxikeludojasari.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/8531def34223882ca12f7ead50a0c05b/45182362906.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/58432276160.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/vewinitoroduxaximiz.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4c6db4c7b---51255326573.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/miwunenawox.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/54843803235.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/fcbhcbf4bgj74qte5ka05jeu3e/mivapupoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=que+es+la+gastronomia+mexicana+pdfPDF link annotation
    • 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_off0000ce4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 18236 bytes
SHA-256: 46df0be5a706b3710075cbb0b1bd1945fef6edaa1a58452ed0c7b51d3eaa7066
font_02_sfnt_off00011480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 11224 bytes
SHA-256: 99cf15803d7c1b993924d2c4e9786803f4425bb52cfcf6d38748066696dd8913

Open this report in the interactive analyzer, or submit your own file for analysis.