Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f4c8994f8d3162…

MALICIOUS

PDF

68.9 KB Created: 2021-10-02 23:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 58f82f872548f7ebceec69ba19520673 SHA-1: bb0274fb622db2736c72a7ee31dfe304bbe4224b SHA-256: 78f4c8994f8d31621fedc99b7eaef8d63d9847576641da284429ed130dcc6a37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure suggests it's designed to lure users into downloading additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161377c048dc77---12159476000.pdf In PDF document text
    • http://emeraldcovepartners.com/_data/images/file/filumuviguxusamelu.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/30641187082.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/sudemuzigidukedot.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/jowixizodoneviniko.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/dujeg.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/mimanejugax.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc564e8ab5---mavugisujojifez.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/1245725418.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/98063382449.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/86859948765.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/xazigubetugoxetewode.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/61866564036.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/xiwesidunejopu.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/pupugiv.pdfIn PDF document text
    • http://01host.ru/userfiles/files/majokaligus.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/48497693866.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-25-15-10-37-34.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/vedisotosate.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/wawesaz.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/vejajisuruvipazajiveziru.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132252622a9a---42945646294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=kindness+world+dayPDF 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_off0000ae6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6A 10336 bytes
SHA-256: cb9277542d51b5023ba0a418e550c2a6f08167b1c14c9ffe6c4555288fa5717c
font_01_sfnt_off0000c5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D4 16324 bytes
SHA-256: 5b4c45859b4abc8cb8636085ed94fa4ffb2241fb73cdb2f1bbe58c9f2e97cb19
font_02_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1