Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc4810cf5b14a8f…

MALICIOUS

PDF

89.1 KB Created: 2021-06-27 04:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8e3bedf02178b821e76ee5a76d55ee82 SHA-1: 5cb843ad8230642311a195cf96c630d80d60cc92 SHA-256: 1fc4810cf5b14a8f3391729562d7c10e970bef131749cdb6d183ea65d1091243
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress uploads and other potentially compromised sites, suggesting it is used to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/pl3trqtgocve4f7022vvle6oua/mizirogit.pdf In PDF document text
    • https://mvpartners.be/images/uploadedimages/file/vatifobabil.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/firukemepogisixuxijovi.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/bajufe.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef53ce7921---dovifowesudoxorowimusaw.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160862d2bbd10e---50414165953.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/14274940746.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/99308284288.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/zafidikejibag.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/darmea72fbneq3jb5jd3h9fc3h/6720141335.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/o62iedb1ldkhv7qh0pa8cp9cp5/jaxesefuwelip.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/6bfe8a51073ce359a254265899c6ff5e/63416023352.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8611fc5c0c---pofovofelinixe.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/rha7o0dgq9ckcqcn8f6snp1v44/52610246581.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/cc10dc528a5a2ece0d5ee8720cf67cd3/pemegofujebivo.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c064370f433---83561346428.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd61a6b6ad---gefedijipodi.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/85730773125.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/jimamoxemigawowik.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/f427bcd6aff17178f0215b2b3dfd7b44/vanavixijurefek.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/jomozunik.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/3206d084c585d69e4c87862298d4e3f8/gozedabovuvewaro.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dda2805d2---fusev.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/97486284163.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/21877151892.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/xatelovebazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=grade+12+biology+textbook+answersPDF 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_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 11168 bytes
SHA-256: 21cc0ae536734bcad54068a946bd4ed66954c6df3708e22a4feaec941851a447
font_01_sfnt_off00011486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11486 16424 bytes
SHA-256: 690ca60f8bb36240721ceb9e756f7672d2acb8e3f54c81128f1206a557842c38
font_02_sfnt_off00013ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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