Malicious PDF — malware analysis report

Static analysis result for SHA-256 a693b0df14786cb9…

MALICIOUS

PDF

78.6 KB Created: 2021-07-17 10:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8b3de3a8f878f5efff5b7934561235c3 SHA-1: ae07a236481df71a2e7a1d2da3c5a32d9c4f2d37 SHA-256: a693b0df14786cb94d7d200e298e2345a88bd7bafd9013112bad6873b48518a7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://elnativocoffee.com/silver/upload/files/36555095158.pdf In PDF document text
    • http://tensoinox.com/userfiles/files/12727561654.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/tepezurudanugewitutovu.pdfIn PDF document text
    • http://firegallery.ru/img/upload/49561464916.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160da1b26a3e5e---53678237577.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/828f98bd626bf28ab86cd30bae2e3c24/pasuguxofida.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/bojexakefo.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87350421aa---zatiwupudedamovivim.pdfIn PDF document text
    • https://termocasasrl.com/file/zofikutabo.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/32283dc081e0eec1030898a21dcf556c/sisaja.pdfIn PDF document text
    • http://ashioke.com/images/library/File/gasesisoxuzemanak.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d67ac41380d---5058203412.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098468589659---61108791484.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/diweran.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0368839e1d53c77dcde70ea8e1e04d90/5090880401.pdfIn PDF document text
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/gigogelotozug.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/rewupavidipagoderobud.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/tvqh9ddpt22t8itkohjbtqjcc8/kofatagowavofe.pdfIn PDF document text
    • http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/82142988903.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/43302170471.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/47198242526.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/551081ff994fe563a0f44d5e8e1e0134/jaxit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=linear+function+word+problems+worksheet+pdfPDF 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_off0000ceab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAB 16404 bytes
SHA-256: f2eb205d8e78d0cf00171ca204697da1ec1afae3eceef548649edd54290a1ef7
font_01_sfnt_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 11260 bytes
SHA-256: 784cd2ec085798e4e4385d95ec38f03d5aed32d0b673ca7249020fd29bce9d57
font_02_sfnt_off00011348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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