Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36ec8fd7990ef78…

MALICIOUS

PDF

88.3 KB Created: 2021-09-04 14:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a447704e46252eba922b56613251e069 SHA-1: 83bd3ea1cf31354d9939bfbd784a4ffcde1dd448 SHA-256: e36ec8fd7990ef78c57ccfd4e6a2f2342ffd02723a2573a33c69c8d6ab5f0b04
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains. Some of these URLs are hosted on compromised CMS upload storage, suggesting a tactic to obscure the true origin of the malicious content. The primary goal appears to be distributing or linking to further malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://artgraf24.pl/userfiles/file/kekavinupekow.pdf In PDF document text
    • http://asude.istanbul/ck_images/files/28513608768.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/ninawutiwonogoz.pdfIn PDF document text
    • http://kodemari.info/data/files/sejeruge.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lijuxoxigizipunaxipaduto.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/do53fmgjjeemcjbb0rjvlfh11s/27695138629.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/mopawi.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/928925fa4c177735316b58f24149f3f3/siwotaxunosasujome.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/nogarosukoxi.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/29551408925.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607121c40ba28---savabaripajolog.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/givagolasusaxituguf.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/boduvix.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/10478329621.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/sutibada.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/zesomaguvenemopot.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/13443937227.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9223c321e2097b7ae68f3eeca35eac37/pubefodunuzumesali.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/991374402.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/62570938166.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/qeke2eunbonharr9u7ikt3cf56/72761147646.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f0d34066e72458e46d17ec7b6d66ff1e/72419176161.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/15a5abd27f2c865d4129434c5900ed89/gilideranera.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/2ucdon2diptfm4ia915n6bmvha/92392448350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=examen+ceneval+guia+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_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 20024 bytes
SHA-256: cca1330669ac225ecfb178912fa91439905debd2d5fa6276437b5aeab259a8b9
font_02_sfnt_off00013b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B20 10728 bytes
SHA-256: e639323c56e83118f7f54b1ca6e6a65a984a56c394e0b37d95f36ec21c81d71e

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