Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac9ce9be49122ce…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 19:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dae23c7c4b275996d1dc26c731b81632 SHA-1: de64f43b23deade4413d8fe72b5367ef7fd2fe15 SHA-256: 7ac9ce9be49122ceef75915c1710980e07e5c8d6f78a2396da01c3b07a1a0598
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for malicious content or phishing attempts. The presence of multiple external URIs and the compromised CMS upload link heuristic strongly suggest a malicious intent to redirect users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=indenting+quotes+apa PDF link annotation
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16089526a414f0---47035960535.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7b06f16e---fubesovu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612dfa790b44e---42019101703.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/dinekek.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/xugesomuse.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/1pd36vfl19bfl9ce57dc58gg82/2537225638.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/dolefilufikakovenipa.pdfIn PDF document text
    • http://sb-78.ru/files/file/20661572773.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/77323078188.pdfIn PDF document text
    • http://usagimatur.com/files/others/ritunufenuw.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/4560505433.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/mojekewabim.pdfIn PDF document text
    • http://imi.vc/upload/files/jefoj.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/78492463000.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6f7b9670b---kofafifajilawuxifu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf50799c4---guleradedopudez.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/20003f563e045b4117fc5f478c003519/doguzuzimesebonelojafoz.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/54389342567.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/vasuvaj.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d31ac6b827015ffadb2225c498006e79/dolurixelonarar.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608624d1ca440---39906033132.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/dotuxe.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/73f4b2b6f3dad1228c5ce8e7b7608a7d/12817930380.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/17006118378.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/v0fvo83oio7nf8nn825bp6lon1/9480457395.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_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 10616 bytes
SHA-256: 13afac5c972ec2ab2fd9b73fbcdbe08e95727c4d79bfd81750f187a5f0ce0759
font_01_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BE 18240 bytes
SHA-256: f17b47ce34118f0a5f70e45c83c25981ea8d54eeecdcacd0824247b578137a0c

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