Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d2c1a743a29acf…

MALICIOUS

PDF

88.7 KB Created: 2021-07-30 04:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 954f4fa90935ed1495cd509f0d9d6bee SHA-1: a0ed180a29e7ca8d2b33ca2875adcba713366ccf SHA-256: 87d2c1a743a29acf989a3953dddb1378e8060d3296797f9991604b7946cdcd2b
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware-hosting sites. The file's structure and embedded links align with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0dc71a4e4---duvivapewizusafus.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982a6569a6b---41587900871.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/24618832906.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a9a1faf9a41ed63e17308942e5d02131/legun.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/gamokinolevefideje.pdfIn PDF document text
    • https://businesslife.com/content/file/fupitasavi.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609117a04d799---runetubujilaxewifiz.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/73786689911.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160720f1e89d36---zuroluz.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/105c99f30bf80b8e712c0efa327c87a1/nutudutorubinotafinowuxoj.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf07b9b74b---satejujikevupoxarog.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/356c551cede712dee520fc7101282791/bekobodetikavof.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/sajuvosuvogejovopabone.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/e6bd84bbac4ab46048d8394389f50ec0/16424937805.pdfIn PDF document text
    • https://orangerun.re/photo/files/gunebujiz.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/kufina.pdfIn PDF document text
    • https://actor-conseil.com/files/file/8270963361.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/95267783937.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/v7bd8294vr255jd2g20b3oaia7/56777661964.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/53073986674.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/v6m9eu0p2asgk7g5pgim67bh7k/serevudigixarujoxule.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/revibefubewakoxegojikiv.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8559e5cf7fd0e8895ed7f75a2f115e04/25988922322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=future+simple+going+to+future+continuous+exercises+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_off0000f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 10980 bytes
SHA-256: ba6dede390d89b9c94478c1b5b8c5bf4b8b82674170781e94eac70145bf52b83
font_02_sfnt_off0001274f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274F 17084 bytes
SHA-256: d0af41e6f7c1d21710b1c373f2cfff6ac95504b85a33b2980a840dfd640407f8

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