Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a62876d4c18c8a…

MALICIOUS

PDF

93.3 KB Created: 2021-07-08 02:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 704540d1eed1d54f7fb2eb5f728b612d SHA-1: 2451cf1d6bcfebc445877e1bfe9c5072c30ed179 SHA-256: 87a62876d4c18c8a249aead0bf1152d571efb3cfe2ce7932d65dc2d2163da82d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness, with the links likely serving as a link farm for SEO manipulation or to host phishing content. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific intent beyond link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b434d16bc1e---79359205833.pdf In PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7e59bd2dd11dabc63d36f22c8050f510/4047239143.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/jimopa.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/zodiwame.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/11748597629.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/60746515489.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/53854700069.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e08ed957300---62853207578.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160767b068273d---7290090966.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160759433021f4---jezidugosukejagoz.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/37254500658.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/pusajoxelopunuwivu.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/97abbb2837e1f9822625dd22a3e76248/93064154673.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b258c347ea1---gotavamire.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/49783679316.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5eb6233a28---35590756937.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/83555128586.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/56356283218.pdfIn PDF document text
    • https://vestol.bg/files/file/nazajilarigazaresebojabo.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/33590451003.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/gusovomodufirige.pdfIn PDF document text
    • https://triosms.com/userfiles/file/51974156717.pdfIn PDF document text
    • http://camonetinternational.com/files/file/55521821652.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607979b267550---46951833289.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/oig5ijgtjnroqqhur9jb9ih643/kulasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=famous+surname+in+spainPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8208c812ab49bf6a16aac553c3bf6259/zazawubisodelimok.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_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 18360 bytes
SHA-256: 3d74fd3656d4a55bf058b6274f2118c98e2dc56ecb2cbcd76a670a170b791ce0
font_01_sfnt_off000138ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CE 10344 bytes
SHA-256: bf13c14a6546a2e803c6fb502fe2f03aa6a7606dbe233371d4681e9245522983
font_02_sfnt_off0001501a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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