Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e65417754b5672…

MALICIOUS

PDF

99.5 KB Created: 2021-08-15 22:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 07040c50761579708fe1f4b443dd28cb SHA-1: f57c0d852b84e3bbf7d9d3c43c4fe05225bb5c82 SHA-256: 56e65417754b567242953bce4ef0eeb1c56d092c2d2b51635acfb81944efedd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://zlato-eu.cz/upload/files/goduvojawelexi.pdf In PDF document text
    • https://vvpta-irvine.org/userfiles/file/15701423159.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2efab40ec1---buwipodo.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0bea2741764bb02d1914419a15577ee2/96229023152.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160adaa833fa91---mamamed.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/vgo0iuj5oimeb7p4kns9abjov9/xivatiwavuvukawuwesez.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37c76bb85---rugekadipodiwozibufodixas.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/vimumazederevini.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf5711ebd3---walagirutususer.pdfIn PDF document text
    • https://wrd13.com/force/file/zudetemugulukudapadukasez.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c91313c3e6b---linabofu.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/dojududewageromupuzukug.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160772341ef11b---zokasipogokutotefedetox.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/tuwojamurigi.pdfIn PDF document text
    • https://tangentemag.com/img/file/tuxadewamitiw.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/9425414747.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea52765a08---55242781261.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210714_135042.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/50051149994.pdfIn PDF document text
    • https://fallsplat.se/file/87896822535.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d0632d9b6f761c950ac193745792f024/temojopoza.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9fff7ef77db99b1111862bb05c796026/70260150785.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/fofovasiwixi.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/29962646511.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/sagiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+reset+a+totaline+thermostatPDF 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_off00011fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEF 10448 bytes
SHA-256: 13c9c91c7bc19281d6d4f5ce4fd0688d4163c96ad9e1598dea440b3631405852
font_01_sfnt_off0001376d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376D 18364 bytes
SHA-256: 5673d33565a9d15d6544057833decbe21b2e6fe7c19b3cdaf896e81d6565099d
font_02_sfnt_off00016735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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