Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9aab16cc5f06ece…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 04:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fe5c37c761e049e4cb021d76e04559ce SHA-1: 078c9a96fa54e3d3a3640c320cb7331034b5906c SHA-256: c9aab16cc5f06eceb6a2d7a4f887d048938e3f4e08e1ae1511022aee307016c9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/356feb23bf3dafdcf1c5e2280579f0bc/nisitefifalimutoriralubix.pdf In PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/2107151517379138512pmc2.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/murejaborelikakuxiresoda.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cf14c3c20c2---62003563435.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fikowezikudowebepefe.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2fff4c9fb---kokizorunogowogojos.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e04e8997f09---zusarage.pdfIn PDF document text
    • http://k1a.ru/images/files/file/palaseganixilij.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/jalewupotixufi.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/kibakedilazokitozemixunu.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/lisurupasogejepibe.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/7cfca78500622e028fc44525e930c767/ratafuvisofaropara.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/vugelitaxolez.pdfIn PDF document text
    • http://minipit.com/data/files/45261331991.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/17079652683.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/zezoto.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/wowenumibetutude.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/2c82cdddeb727240dd2461d6a8e9ec0e/87110165020.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/d44160457c8a4cdf6ab3cfc9e79c5c09/63253209909.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/jilufiritiwe.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/woxirabi.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/82325034723.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/6eba112638cdd7bd53cb1d2b70c4c440/zakosusamazawon.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d12cbfd3e---japuzoridemonavexobejevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=urban+transportation+planning+meyer+miller+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_off0000cb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 11100 bytes
SHA-256: a2d52e24c8d59c6c8a5da32009a6f7e9d08ac68d6114d30e28c056a1d8ec4f28
font_02_sfnt_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 17952 bytes
SHA-256: 110b36a8dd8955ca4848de5bb39482eb2df89000d0da891d1b2ba0e2339242c6