Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1309e8f43a7970d…

MALICIOUS

PDF

85.9 KB Created: 2021-09-06 14:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 34e08e9d7b954dc26cc78d5322ffe47d SHA-1: 5a4c07b0fe9d85036f4596e81ea983bcf339f4b4 SHA-256: b1309e8f43a7970d7e5db8a1ab329b43d6205bdc55d9ebc2c7ee74ccdb1eeee7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff6cc162606---xizejarid.pdf In PDF document text
    • http://assushop.com/userfiles/assushop.com/file/53241037905.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dfec7204a1a---87733912713.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/notakajokesukurir.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/57b1ce978ff43a0f1c05d1790b4172e1/piwozijasemufir.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/sulujuv.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/nowiwuxunufixik.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/22578729215.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16078fd6821f38---nixadejizafufuxe.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/55701398475.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb05f08dac---54835368805.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/fe5db3e161867db9465e43b90ca31250/53195715481.pdfIn PDF document text
    • http://euro-ex.com/29470913474.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/leramitam.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/79333586447.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/d87b48jp1qih5t8fk3vmlcdtt4/19246285077.pdfIn PDF document text
    • http://www.agot.pl/upload/file/rerinafazisil.pdfIn PDF document text
    • http://snsi.jp/image/news_file/xopusunexeboluwegum.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/30218999868.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160788ea23e735---84171594946.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108231930429083.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/bavotatukogevaju.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/5ee9cfdec5211c8b0149ed26814302e1/vofufasusamugelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dialectical+behavior+therapy+workbook+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_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 10944 bytes
SHA-256: 915817024e3a574c4d8fa5b36077dbb1499e80c3f3daac53cb959625c7a68096
font_01_sfnt_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 17956 bytes
SHA-256: 37be17accbd8e290238182f74446f391f24597c2ac33e44c1e3864e3db76877e
font_02_sfnt_off00013220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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