Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58aae05397029e3…

MALICIOUS

PDF

76.5 KB Created: 2021-08-28 07:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cd2a91eaaec32d8e36f93aa463cd4049 SHA-1: e87c684348158dc9179d3e237822b3d8d4871133 SHA-256: f58aae05397029e3035a724d6cccde6e379430e68971a7566191d6031a275836
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, many hosted on compromised CMS platforms. The primary goal appears to be directing users to potentially malicious or phishing sites.

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c0e7da10a0ea4218dbb8a239ad30f55f/legulutawewamukar.pdf In PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/vefumolejo.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/57224487947.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/77f339578ab01d1ebb90d9c6e3bce87f/jusafemewoguviguvud.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096ef902a4e8---16236386018.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/lalevetadexivenopen.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/32530601996.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/rutufotefumukurotuloxel.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e10ea5277---22493568910.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/61830122523.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/49795862299.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/70442843814.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/kavutifex.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/runesuvepupegezawozilaro.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce32c0af6---jubevenobis.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/nubotiwisivosat.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/54119246022.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1f60315a2499a630bb663a33c6cc5da5/5083773998.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b58939cd8---nifomozepe.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f9bb8a2113ad44f37ffee88928b4d16d/saxoxasovaxevik.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/21056296636.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/laxugemolududifimixowabi.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/kg76ea2j6im8g1vmh0pmejc5ui/61868190150.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072363c7428f---kopebelebeminiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=eleven+sided+polygonPDF 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_off0000c9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FD 10372 bytes
SHA-256: 0bda1b4e0abb7ee157580a7350fedcddfa9c089de220d8589cfdc822403a5a40
font_01_sfnt_off0000e14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 16740 bytes
SHA-256: f0abcc4586a35d7446867c1cd573c69fd83e4e65de6085b5a3abe6f65fede52c