Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f008c18a3d74765…

MALICIOUS

PDF

91.3 KB Created: 2021-07-06 06:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 48bdb97ed15c77d81dd39646eb86fe40 SHA-1: f5ea3c95b626666c473e17c2b833260dcf4ec58c SHA-256: 7f008c18a3d74765fb113e6f4fb58740016f787b2b00ea64a0e9897f51d32ba3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are consistent with attempts to lure users to external sites.

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 https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9805c6a863650047db0c5aaaa637732c/99905112227.pdf In PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0eaa5607bd53e6bbc17206cb98b092af/42149412483.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cc2602d8111---wujozagiwowaxa.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f087d7519493d6986b54d2242c237198/bamibawejavanulesufatin.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bifojufogogivuzafolig.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021512155012138.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/49774605298.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/1fad4b039de177651c37620fa1ab3731/183988352.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/jasisuxolabawifevosinatur.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/bd4713892be3246e82f086b9b9003481/demekiwozevijenopaduzeni.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/8333315030.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cec42bee4---vokadobugizazubafusit.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0def71742---munitizufad.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///damijonipinasuwekirek.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/zesozogikibixiravigo.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/9c3ea7d47fd249256fe7890018baf42c/30020864117.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-27/20210527184142848375.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/88225903621.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/90975656946.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/0k1r6tp9blkjbda0c4p20ltna7/jedemodofejoraxid.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df4208f5db---pafujimo.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/puvujotipolaxuworerexel.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/q4bud3po844ie4jqa5i9d35u8h/balokeraboniwipiga.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d5eb38b9aa16ecb3941d7e643dc0a4f8/doleluwonawilonisifaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=diary+entry+format+class+10+cbsePDF 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_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 10924 bytes
SHA-256: 41e6869b0ecb1791b8a7cfa6022fa3fdc0c8af971b7c8d3f8122f3f008e16099
font_01_sfnt_off00011b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001333b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333B 17612 bytes
SHA-256: f83bc5f3de08014281e580b12435e080f40d62aa9fce09a5e2c29fc30112813f

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