Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37f4c1ad19e8fb8…

MALICIOUS

PDF

86.6 KB Created: 2021-10-04 16:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ef908a0950332d90c520d57017777e77 SHA-1: a5f5c42a8953c49ee7489665e482cc8559b8bfd7 SHA-256: d37f4c1ad19e8fb85fd913ba72d02d4ca9ac55f4191d7379f6ba05a41f32da5e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the document is part of a link farm, likely designed to redirect users to phishing sites or download further malware. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zerosquareonline.com/file/27417463879.pdf In PDF document text
    • https://encoyun.com/calisma2/files/uploads/63392829235.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/pujoje.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161588055e8579---donowopekurofawojijinoduk.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/timotasolizejipav.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sobumevevifotudekeromikib.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/72926936340.pdfIn PDF document text
    • https://nevisnews.com/userfiles/65930005252.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e496f507ac71f4e26b28fc474d9a5339/sanupopiza.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135333acbd75---39187153680.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/20852976988.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/58742814746.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202192689463234.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/xovepetonesesovexovag.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/xinimawutolabotufeg.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161507d763a7d3---92825951402.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/gubumigowumamub.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/39361016432.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/43598463614.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ead350845a3ad52f699bb40c53616c17/59901667611.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/liwoguregorulik.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/rudatorurutuwunenax.pdfIn PDF document text
    • http://koutingchina.com/upload/files/30482436088.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/pidabogumetifizu.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wexivegowudip.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/bunimuf.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/relugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=skeletal+muscle+labeledPDF 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_off0000ea44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 10524 bytes
SHA-256: 66ac6840b9824b5d6ba8ae885f80fc8efdcf0c40be1117e643f74776f3b881bb
font_01_sfnt_off00010251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 19384 bytes
SHA-256: 0ddbed7b20decf1aad0f63c6a115569dae9f7dda835af25616b47d6e55a36bb1
font_02_sfnt_off00013446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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