Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5bdd88cb2777a5…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 11:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51247018176022ad1bae34de02776863 SHA-1: 3bbd1b882d3a56bb71e25371c6f2d4f2a791de93 SHA-256: 2e5bdd88cb2777a588d8aba45e992a924ffca49c8d93ccd83edc40bd52baff09
156 Risk Score

Malware Insights

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

The PDF file was flagged by a ML classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple URLs hosted on potentially compromised or disposable domains, likely to facilitate the download of further malicious content. The presence of external URIs and link farms suggests an attempt to trick users into downloading files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://erago.cidees.com/uploads/files/nenipifibogevimewe.pdf In PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613951ac7c223---23647304909.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c49002ad5---8053031941.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/simopofo.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/migerelefalozudefiripoxob.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/xajiduxiruzosef.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/49915807332.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/ripinulofitobi.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/soxibizukikavuzifu.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/rarazugu.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/98979339777.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/75134167916.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/58060314988.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161313389dd606---48827455885.pdfIn PDF document text
    • https://brukspec.pl/upload/file/57673690212.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/26412410520.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37992083309.pdfIn PDF document text
    • http://scsychem.com/upload/files/28490842448.pdfIn PDF document text
    • https://eternalbliss.net/file/zikerel.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/65246976158.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4d1d6a705936dd3b90f12cbe7a291a04/43400099063.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/63465608336.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/382gpr8aqns0pg2dam8vmmm9v8/93985907851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+real+gangster+crime+modPDF 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_off0000ded9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED9 10800 bytes
SHA-256: 4bf6ae61dd3c61b03eedce995cfe70830ac345c47e744a602cc6c2c4407d7adb
font_01_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA6 17472 bytes
SHA-256: da5dd9d9185d802c10be8b0054fb1803750f6d0f190c3e19672f2ca5186a084f

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