Malicious PDF — malware analysis report

Static analysis result for SHA-256 47cb20d9761ec407…

MALICIOUS

PDF

86.5 KB Created: 2021-06-27 10:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b68cc5859784335527c86a86228835eb SHA-1: 25f65b7aaad4aa1ddaeb1536d7f0b222950eab6e SHA-256: 47cb20d9761ec407e11782d046867b45d1c7800b7656cc58779b1deb660c2bc4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external sites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm or phishing lure. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to press Win+R or paste a command into a terminal, a common social engineering tactic to bypass macro restrictions and execute malicious code. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to lead the user to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://genericdiabeticteststrips.com/userfiles/files/talokofadituresoduxulusi.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5efe70fc9b---82922158060.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/2n2uatrnc1mathdub8tjn6qtpk/74655953979.pdf
    • http://chukgoobok.com/files/fckeditor/file/mamixozozipanozema.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c14852e71---pavuxufitugalilife.pdf
    • https://africanresearchcenter.com/userfiles/file/24363639641.pdf
    • http://ty-universe.com/image/files/20210623_135054.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5f0cb51fc---nobir.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7939b5cd1e---ranutozuroves.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0233eaa6c---16668183055.pdf
    • http://chapelguild.com/images/usr/44757427358.pdf
    • https://lacecinella.com/writable/public/userfiles/file/79094741193.pdf
    • http://3bbb.fr/ckeditor/upload/files/76013695472.pdf
    • http://aylincinarli.com/fckfiles/file/11123320447.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4472838cc7---11103469423.pdf
    • http://guides2alpes.fr/uploads/file/mujibupezuju.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/4b9be89814bc09b51a0726b9604445e2/luwawuw.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/11bd4720257fa65c0116e5966c9a2a55/gafumudewodopafok.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d9ab09edd5eccf7cf099c63e6795c08f/firoxat.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079abe2f0f1c---fujawomilewonovinu.pdf
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/kagiwemin.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098925145cca---5222189465.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6c2563545---meraxar.pdf
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/80615935619.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609740ad52be3---jugasorelefiwutubugufuj.pdf
    • http://adveotec.com/img/file/37681674158.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=diagnostic+policy+not+running
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc8.bin
c60de5e008a5baadb0a6ee00efbbdbaa3492ea66b31407b6e622bbed0ab0063c
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 18428 bytes
font_01_sfnt_off00011c04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 16792 bytes
font_02_sfnt_off0001341b.bin
be6a96a7bbb736c4a2b8cf028afb3b62713a0556be3551bc6409f983129c694c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1341B 10632 bytes