Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6c013c57c934f0…

MALICIOUS

PDF

93.3 KB Created: 2021-07-18 10:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e82d8c8e7e1eabf88186cfc15770f0a3 SHA-1: c227e956d43c35d6b754ea647cc4ecdbd8bb3f54 SHA-256: da6c013c57c934f0a2c61cde66f6f519fbc56b8e5f905bcc3ecfc822333bb567
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://samsungklimalar.com/upload/ckfinder/files/39479570335.pdf In PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a16759d3a---18672399574.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bd01eaa5f---sogurevizisi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/goksg55jmkji7e1e1561sldol3/leruvufut.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/19990389232.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f980093333---potaponan.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877266473b0---54500478079.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/jedapomis.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/98dd9181d11be281f315ea72d2671ad2/41924940138.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/24456845094.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/0g69sca90unl4rlsa7s3ndacce/29664021230.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/76181807104.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/xuzeze.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43067bb424---nupovefotuwuxuxodilatidox.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5b723705e---rukajidadip.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/19762075173.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/jagokemevifogavida.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8a4735e2d35ebf9ccde9068c7a7f8b1b/22846275961.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/sru7p69e9dboprath32hb22rn8/78472477761.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/23f70ef6c052da7f7da6aa94480e5ded/63567193090.pdfIn PDF document text
    • https://immobilgold.com/file/puzepus.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/tegojas.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/abf6a10bedb8c6438dfce4d7fbfacf6b/sovewogegadizivininus.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/e76674802deca143d365ab12a7a65f48/51900046638.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767eacb0029---13415979662.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833b208c27---pavalefokoxafebogisol.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/60621102488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bentonville+driver+control+officePDF 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_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 16516 bytes
SHA-256: f0300bcafdc7e1f1415c815788f46f0d610796cb17987e4f9124fe789fea48cf
font_01_sfnt_off0001388a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388A 10260 bytes
SHA-256: 1b5fb814a6707bc062c9350231c010f01c186dceeecb437cbb38f3dd7678b130
font_02_sfnt_off00014fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1