Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace4f2298baa3e22…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 03:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fd5f91f8b12e392ced084df8e5dd51a1 SHA-1: 8c48a5c5ab9064995c053e6a5a676e339a79aa7a SHA-256: ace4f2298baa3e220b5aba919450c836c538618f0dfa677c76cdd3c09cdac5af
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://infrive.ru/uplcv?utm_term=impensar+las+ciencias+sociales+pdf PDF link annotation
    • http://ansing.nl/userfiles/file/vebatisefamaf.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/861093334.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/15401098250.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/12ba9f626457b74dd27b1e79fca0071e/ketemumete.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75040127679.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/bemexenobe.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/88401310082.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082599228b2b---sefopipadazobalo.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/15037284379.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/retevupudemonirelalo.pdfIn PDF document text
    • http://www.bash.cl/media/file/tapeganevuzuzatapofamir.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/50059564029.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac83f5bbd26---87288452645.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/kunesig.pdfIn PDF document text
    • http://glcore.net/ckfinder/userfiles/files/5586459299.pdfIn PDF document text
    • http://firegallery.ru/img/upload/27295543731.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429200213561742.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/b8165772b200696f42c7ff7fe437522c/36022935089.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/venopisufovopupikoto.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/gobepototugunifalesegisum.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/kezusamimipa.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/0b1de282b0ef58de957208f9ba983865/6643469079.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/85916293734.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/dubakepidujepadogugevaju.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/19494657876eb188cb6222d7a70e57aa/bewelenekatoma.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cc9a83cd7---xedigazif.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_off0000db1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 10636 bytes
SHA-256: 4d281957658ca5268153b9e71aaa7f6280ac87fd2114446dde0236628a8446ca
font_01_sfnt_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 18420 bytes
SHA-256: 357cb65b0ff81ac6ff74ebb3cf65c2626125d77c6f766d591183dffeea4f3381
font_02_sfnt_off000121f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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