Malicious PDF — malware analysis report

Static analysis result for SHA-256 518d75e7d5993aac…

MALICIOUS

PDF

84.5 KB Created: 2021-06-30 02:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 202f8157d24e53457d33e35b34b6942c SHA-1: 9ce4ba1fe6e9111e4b0084aab33b9cd4429f90ee SHA-256: 518d75e7d5993aac911843dbcc78a8c63b5c7fd4b141a36cc5052f0d7e4ed1d0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures to download further malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5143d465e1---99472192838.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b607377629---47881697151.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77fe30286b---98399764398.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/28005931418.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4b1b63c45---wiwilozevagaxexevodovag.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/4e972698b9c0758a2871cf8f1700ff9a/bovorodapibufof.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/5f7e2c8fa525f87eef4607ffe8344a3e/vedejap.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/64287511634.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/fb00135299466fc3094ef3f6a0f1ee1f/85049577418.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ddf076389---60082782118.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/i6jpj61fqgb734o1kord2r087r/wepawo.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/xazomo.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079f03fdea21---lijopamazufoma.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/69855224676.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c796f3000---rawadojapegibefuwe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c89503e16---pilenorarepinatodide.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/14851864707.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092c33add06e---lugonutexuxusenidejasu.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/baxegasu.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/vv9eq10eengfco82u5773bvv6t/kiruzujikipanuvurivukipo.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/80774914914.pdfIn PDF document text
    • https://makenie.com/upload/files/55493966715.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/82620853790.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/4965c21391d31969de34c0385c446360/dofepeparujamipurivuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=nose+bleeding+is+known+asPDF 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_off0000e985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 10520 bytes
SHA-256: fbc56dbe6fde48d6582ac94e488bcdceb1f1f2a370937fd0dd235ece5e3db976
font_01_sfnt_off00010164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 16616 bytes
SHA-256: 993c6e8e6864e855c208e03490287708a4c837b9b3ab7090c858064a5f2a1aa7
font_02_sfnt_off00012c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1