Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f33652ccc71543f…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 15:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ef127e6f07f854348197a7fbab6af75 SHA-1: 0124c2bbb9e7feddb58fdb546164b3f199009c1a SHA-256: 2f33652ccc71543f576d8d3e7aae79818fd406aee2ff1a3cc3dd7a755243d737
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute traffic or host malicious content. The ML classifier strongly indicated maliciousness, and the structure is consistent with SEO spam or phishing lures. No scripts were extracted, but the PDF structure itself is the primary vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=2010+honda+odyssey+shop+manual PDF link annotation
    • http://logo4you.dk/userfiles/file/55100819381.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/97270363952.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b3917490540---50184515675.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160702fdd2d326---61014027295.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9420e883e---maxusulumenag.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d4f0155192d49cadf4714c00a41cb3fc/37975942978.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba94c5feed---lifonekixijujujaxumizo.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/45276408575.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/22645033833.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/1914509003.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/werirolizosolipolefurum.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba03c9fac---lumenezewel.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8e8671273---surejibulivulomodi.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33f6415151---tozidawivapiritisaxerusan.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/16851904513.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/dugaruvedadabimo.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210829233149.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/7aa96c934baa43188653fb0e7e70354c/sapakajakakipep.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/rowalenivi.pdfIn PDF document text
    • http://unityproductions.com/upload/files/tisotarunojawelof.pdfIn PDF document text
    • http://deauville.ru/files/file/tudapatusak.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/3fe61ef82a8396789c2de1bade04e0d9/55465571335.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/zovunopa.pdfIn PDF document text
    • http://scarpatti.com/files/fojobapanaduramufode.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611410addfaa7---13499676292.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_off0000d567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 18256 bytes
SHA-256: 3918612abd38847edcdb1447e9497c8296027d0d2e8938b5802a39fd27f68473
font_01_sfnt_off0001041b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 10776 bytes
SHA-256: e099e426f01c9e921a46d07172a27a57fe24615a9ee6a261277433b61742aec7
font_02_sfnt_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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