Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95d469dac3b35b2…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 15:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 008de264234ed718f46dc9d4646d0b19 SHA-1: e5e1c18e88542a99e93a8ca90521b15a866851d7 SHA-256: a95d469dac3b35b22f00a8ffd13c8883a283d106a53e97ac4054281d46c21a55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being part of a link farm hosted on compromised websites, suggesting it's used to redirect users to malicious content. The presence of embedded URLs, some pointing to compromised CMS uploads, further supports this. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e8df92803068606ff06164720805071b/wikag.pdf In PDF document text
    • https://myshalewell.com/userfiles/file/89566457512.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/82678328315.pdfIn PDF document text
    • http://brlairport.com/images/file/minenojozobut.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/42482829717.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/td4jmj0t1vetb4jeos46caeure/64366332372.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072c95c6eb3f---85792338161.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/ganamovorapetuxawol.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16085589f8b2b1---52680774096.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/84349661319.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/ee64c79f76b7f3eb3c6026443a8921d8/4095688597.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74f11f9ae---motasuwipuzurobasunon.pdfIn PDF document text
    • https://umartravel.com/files/fozexetozovamerexusebuke.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/libaj.pdfIn PDF document text
    • http://uhorder.com/upload/files/92497106684.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1627080710_1.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d1dd66d2f---98089600218.pdfIn PDF document text
    • http://sy-smile.com/upload/files/55317129719.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/49541711108.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/wipozadomonon.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/80276297988.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/nafodedab.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/jivizopo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091d6e645cc0---18104103871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=coronary+artery+disease+diagnosis+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_off0000d535.bin
93e458c74badda26d504675ade15fbcf58e0272d4ebdea6080f10182e05f0d14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 16824 bytes
font_01_sfnt_off000100ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 16792 bytes
font_02_sfnt_off000118c2.bin
26bc0abe59b94a2a3dc451ec86c5f6e0749c32c871d77c5691de19287642c2c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118C2 10772 bytes

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