Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ffab18d6751ce4…

MALICIOUS

PDF

71.5 KB Created: 2021-10-01 08:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 289e5338a4fda09a5c4c6048bbfe32b6 SHA-1: b2cd5edd69b21f621f6ccab7a2e84faee6a8776f SHA-256: 56ffab18d6751ce44beb32ebe16033b7a7d594dadf5a8ceb7538e063be268df1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics indicate the PDF acts as a link farm, directing users to various external URLs, many of which are hosted on compromised or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest the PDF is intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=app+download+statistics+ios PDF link annotation
    • http://hzzxtl.com/UploadFile/file/20210914033238417.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/vafuxukuravikifugezalom.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/26626275083.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/desuvoferesajinakoxevo.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/pekojekukogupadowowuj.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/blfnjtbguif4ej7f76872m09o3/37371903693.pdfIn PDF document text
    • http://ore-processing.ru/d/files/96703261830.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/76444219818.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/doxugadasomilutijora.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138894b7f017---2774926257.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/nibaralixogivu.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/41081615348.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/49580671026.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/v0al6mb6v11njguef4gdqtqan1/rokuvoxiniforajabekovaz.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/9527857250.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/ruzajivejisofinegosamib.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/41941399641.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/sazelojavepe.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/46236693008.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/98435839596.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/nanerodema.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gadedi.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/biseduxofulofotasajogen.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_off0000b431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC48 10344 bytes
SHA-256: 9997455f53958e6714efe6aed5ae3542c3ed635a89c004a0d2b78a583c1eb9b1
font_02_sfnt_off0000e3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 17428 bytes
SHA-256: 26f6cc92a60c9edc7fb5119a31027de5c01da45866bed7030dec044aaca5cdc0

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