Malicious PDF — malware analysis report

Static analysis result for SHA-256 5715a26b7caded74…

MALICIOUS

PDF

85.0 KB Created: 2021-06-29 08:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c8ad142895b92e8a23fac6ecda497e1d SHA-1: da92e04f039f7e7cb12eff0253a115532ba69dbc SHA-256: 5715a26b7caded74a9d17c04253a0ffcc84cce4cd45f04b6f995a19cb2e0b1c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farms on potentially compromised CMS uploads suggests a multi-stage attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=sample+letter+to+us+consulate+for+visitor+visa PDF link annotation
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98c4356087---jenotezo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e43ed39b88---ribemureze.pdfIn PDF document text
    • http://beateromer.com/bilder/file/wigasalisisozaxiwajoj.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/74694413756.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/91134400951.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/91575756407.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/sekekepu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9ef673d6e---8682574342.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940a9f71b0c---61964606628.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acbf39a277f---rurorisufux.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/82a9a0723286d11f2508f019a71058c4/nilekedarafunikoporori.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/suss90pt7it48g52b31jimn7cl/jepoxipazogoma.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/90bp2sql4hlkp65a6f7mq3lsrm/18319743221.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/xuvubesavada.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a566d26d---xutemipijolibonelevila.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/nukig.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/3ff7881653ef1343384b554a112262fc/nixelo.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/83171520914.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/jenosad.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d578219da27---6061222162.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/girajiparalegazipuxaraga.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/108db546c4668e54ef09256077a55a5b/20438761573.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/bgagfmc2383di0lidbiudg1j0t/23046315433.pdfIn PDF document text
    • 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_off0000e8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 17232 bytes
SHA-256: 050bab11d452a3c31e9192acc31881434d9840d162d54ac933c1dac84ec18167
font_02_sfnt_off00012d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D89 10884 bytes
SHA-256: b48982891d592b62787b50703cfad07bfe0c32879c467d2bf3e1bdc285a0a772

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