Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d989d49e3e70f8…

MALICIOUS

PDF

72.1 KB Created: 2021-09-14 10:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f24234a5b16170e8424affce6f93064b SHA-1: 66fe2ee84e82cf329b4e59272c96f4bd15f62735 SHA-256: a9d989d49e3e70f847fa7c1d5a8e01d571017df672638f3daebd5656cafcdb62
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a tactic to manipulate search engine rankings or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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://nomylo.ru/uplcv?utm_term=videoder+music+downloader PDF link annotation
    • http://houstontca.org/Content/uploads/files/mumumugokuvite.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/jaxog.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/12025730044.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/zopupupukakega.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/74342907849.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/2476442984.pdfIn PDF document text
    • http://ciskmv.com/css/file/mumigotadinotizijebarero.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/zorubalodabida.pdfIn PDF document text
    • http://17njl.com/userfiles/files/midevavavovosowuvafet.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/da9f9f1fd098651365138c0b8b0ef518/figodepojowavomisolis.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614011facf532---vamulemakojo.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/bb6e30759ef7e8066d2d1b5b9cc480ef/55297703784.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/badake.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/66701449524.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/27122701267.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613745c172db3---disugiriwoko.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/nebibop.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/kerenoxipagojopakejulelir.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/84349273116.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/jusapenebubipefusazaweba.pdfIn PDF document text
    • https://bawauang.com/contents/files/81952591863.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331ec27270a---bobebajinevamekomedegamij.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/reserajiwukamagi.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/92838132766.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_off0000b896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB896 16340 bytes
SHA-256: 4b659db5f447316eaa65b8db6e3a2106e6b1a1f0689ed4806b36f0e7ada22a8c
font_01_sfnt_off0000e2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 10588 bytes
SHA-256: b84ffcce4550ed0f8f2157df17773cf63d1a7964f2d1a0233bf7f15cd118188a
font_02_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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