Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3bc715db81efba…

MALICIOUS

PDF

75.6 KB Created: 2021-09-05 11:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf651e1f086e4086b9d6b9ebabacf9dd SHA-1: a0dca2211849389b0c0907f0634d5e7766197d51 SHA-256: 1a3bc715db81efbade81d706d33dd96c2d503292cd1a1dde8e8ced92fbc22c78
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS platforms or disposable hosting. The presence of numerous links and the nature of the hosting suggest an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://zohopin.com/calisma2/files/uploads/rigolirate.pdf In PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/81342e9362efd0fe392105d099a52b0a/9165042367.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/37770440032.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/89570093666.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021071303202773499.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/idsgbdas3sm0b5croiq84o6g17/rizamatelitoxop.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/71040698168.pdfIn PDF document text
    • http://vucert.vn/uploads/files/xeritotomatonasi.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/21545321611.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/nafowigonenamet.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b0a23569225232b327e317a57b479101/rilibubitiwer.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8f173df4---xadufus.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/70059299259.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/52196918669.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/wonebemuterotefusarone.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e0089b539b869c1bbadb023f6c44510a/bedif.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/9425c4c434809dae549375022dfacd02/tidiwag.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/68782844575.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/19823240477.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/silaladirul.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/471f12b02f2c36f5e65916ecb80996b0/37654454618.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098e87e02908---63772445463.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/37247489708.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa5qaeigbpkq5dgcv8dre1cmd8/tuxujatinawamekowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=rpsc+2nd+grade+gk+answer+key+2018+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_off0000bf26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF26 18244 bytes
SHA-256: 2c85f393ac3259d16130b1584f97e5a22a4f50c6067bf7881f19dc33c0d2d1cf
font_01_sfnt_off0000ee35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE35 11280 bytes
SHA-256: a6307547810fc08d92a89c554a31dd14eea798fd39ef5492972a8151e1a000f9
font_02_sfnt_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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