Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ca59e7ab793fab…

MALICIOUS

PDF

68.6 KB Created: 2021-09-15 15:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4b86dc4e39ea4053c24b3bf98fbfdc4 SHA-1: 310c13e46efe5e0d819eedbc04d10e43c77259de SHA-256: d4ca59e7ab793fabefe1c912cb79d014eabe15d1e2ea6863c062e8bf9cb159b7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to manipulate search engine results. The ML classifier strongly indicates maliciousness, and the presence of compromised CMS upload links suggests an attempt to host or distribute malicious files. No scripts were extracted, but the overall structure points to a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://wastran.ru/uplcv?utm_term=iphone+high+price+in+bangladesh PDF link annotation
    • http://fazendasaojudastadeu.net/fotosempresa/files/tesafasuw.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/57545294313.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/64785808789.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/57668992911.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613880484aa76---novezimaxipofesabosi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd4296210e---rasuxifuxevapawufisoler.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/rumexamelelirenubepona.pdfIn PDF document text
    • https://netlandschool.cl/files/kudorigakivetibefexudoro.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/jitirukexede.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/35997828657.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/fufamodexezifeju.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/lesakumifaxup.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/jojimedurekulukev.pdfIn PDF document text
    • https://lecachet.fr/docs/files/907983335.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/32323679607.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/6339560199.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/setegewavakutinazup.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/97856308731.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/011811384225.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/mowozutamunaxexisazi.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rulibipiwumidoredixom.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/32797018971.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/pipimodakuvadojemawowuz.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5cb5eac808f5339ed6554c6acd52634a/88050850379.pdfIn PDF document text
    • 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_off0000b10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91F 14164 bytes
SHA-256: 8c68126554b5bacbf9b95a408212be7ac48f753359cca90687a96e5fb56188c9
font_02_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 10784 bytes
SHA-256: 192ba10d0f4d39adcf6185c29fab1d169969c3c618b8ed08da479d1ed4c1eb68