Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79d01b88ae48377…

MALICIOUS

PDF

73.6 KB Created: 2021-09-05 20:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 74d579e5d1be562c1d39b9b4021f17e3 SHA-1: 947ed3360aafe93a7180f5d21e6eb1445f337289 SHA-256: a79d01b88ae4837770fc5852d74da6a8f4bc67e858b5e9a71c08c12caeb48bd9
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The primary function appears to be acting as a link farm, directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mamnonlittlesun.com/upload/files/satugejevamebimekosa.pdf In PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dafc605f48d---25190765038.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/41059276589.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/q1483e4admbsmn8r3mdabgo7e3/jojawosipi.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210902_FAFFCF7972BBC261.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/42438457496.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ff3a353b09e---parunovowiliboxuzajad.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f26b90fb9---powowenajexuvag.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/38446874040.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/45156662272.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/90424681363.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/96573444974.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/97082100277.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/tilojurop.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/3286014599.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/19879664804.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/788696ec49cb87684832d3f8b03feb8d/19122825778.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/29717290934.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071f6966c50b---jararafigagomove.pdfIn PDF document text
    • https://chp-travel.ir/data/file/jukataxon.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a683ccfbe---xelijoxobanadu.pdfIn PDF document text
    • https://mfdesign.hu/files/file/64349012494.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cad333023---vododokasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=graphing+transformations+of+quadratic+functions+worksheetPDF 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_off0000ba70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA70 11484 bytes
SHA-256: 2218ad35ac5abfdd0b4db5f893a1d8436f472b4e325c4be7f28fc71e79312203
font_01_sfnt_off0000d505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD505 16632 bytes
SHA-256: 89b591730e7a026403b08f983eaa440423dcdf9b127a737b5baba6effd4dd822
font_02_sfnt_off00010053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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