Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b8afe089ebd909…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 04:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ced389c3dd08eaa294b1a4e1fe839470 SHA-1: 418c64de5b801631527e32b9e210c036bfbd2fdb SHA-256: 11b8afe089ebd909b21d70a2c9acc0e7bb3138704bb819b1163af64cb9680876
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tzsunup.com/upload/wotilagatupupufexagamubo.pdf In PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/tukiluxiz.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210912185442.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb25ed3139---17804967057.pdfIn PDF document text
    • http://epmachine.ru/d/files/16733043624.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/kilodez.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/fawopum.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/90974707329.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/50578963654.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/wuzavalobatoxamifuwido.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/ninefuxum.pdfIn PDF document text
    • http://355353.ru/userfiles/file/53483910857.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/61780964056.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/28184485539.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/41919684541.pdfIn PDF document text
    • https://arerp.kr/data/file///fakazerox.pdfIn PDF document text
    • http://kyokushin96.ru/admin/ckfinder/userfiles/files/xewupagofuz.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f96459047a---31766971376.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161394b6486a3d---6646619555.pdfIn PDF document text
    • https://slide-bearing.com/d/files/71698122773.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wiliwipiwakupaxube.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/fimunep.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/52771083720.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/tifure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=avroid+keyboard+apkPDF 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_off0000bbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBED 20872 bytes
SHA-256: 0facdb488ffc74a53b1dd242e084d7aba53f22568ba0fb4ee51afe5c77ea4301
font_01_sfnt_off0000f31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 10364 bytes
SHA-256: 7788e7a67c418e5c084b07dbcdaae7ed4f0e1c56d907fc5951aa45694b33d682
font_02_sfnt_off00010a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1