Malicious PDF — malware analysis report

Static analysis result for SHA-256 43862cd27d7b4c89…

MALICIOUS

PDF

95.1 KB Created: 2021-07-14 06:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 10907929e82427e3b0d6311e1d4ad7db SHA-1: f0abc153df2022f01d79874e343dd1cd011a083d SHA-256: 43862cd27d7b4c89289413cc2e7774577ce2435d4531b7deccfec7662ec6f99c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of links, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The presence of numerous unknown URLs indicates a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c62b92bfc25---sikuwipax.pdf In PDF document text
    • http://growlink.biz/userfiles/file/wepazes.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/nesuzizofome.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/qqc6bp27q6ep4u2h8r3v70i694/39134934989.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/2256903379.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/384988938.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/43836971177.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe27e470b0---pezip.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/0vlj56k6el7d624riku8l3ig0o/wurab.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/zunogiwuvideroxugoxipu.pdfIn PDF document text
    • http://srhs1980.com/clients/877094/File/tilotizetofuximuj.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ns6maqkrun92crtf0aa51npeo7/guwosijunajufat.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a60f3dcd38---96483641442.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/3cef6b611428244bdde631321415afa7/vitukoxefenopus.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf397a34c0---goluj.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/paroxewol.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/14916948165.pdfIn PDF document text
    • https://rajaunited.com/contents//files/20084008994.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b17303d74c1---kibatupiwapexixone.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/42cde3c9a418938d0fd2adb9112920d0/35588043511.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/98728803356.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/notarowese.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/memasomubufoxirez.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/6ba56d95a74242282e77391266877b11/pidex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=holy+paladin+bis+gear+classicPDF 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_off000111d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E7 17184 bytes
SHA-256: 99da81544b13274c842217893d8bb4b84705eac2efa4a2bdf33bd24273ff3c18
font_02_sfnt_off000156ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156BA 10836 bytes
SHA-256: ed40faf2e97461707c943e28176d7932420d324a1b48d9117a32f755e4c2d5fe