Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db6acbad6e12acc…

MALICIOUS

PDF

96.4 KB Created: 2021-07-04 02:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 447f591451f6aefe51660be9936b25c7 SHA-1: b827107a696f55d302bf88d004a2914a45ac10f1 SHA-256: 7db6acbad6e12acc5950b3ae41a502d5865891f97a462445e3f455b76273ef57
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Installation

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files. The document also includes an instruction to disable security software, a common tactic to facilitate further compromise. The presence of multiple links and the nature of the hosting indicate a likely attempt to lure users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b40351a2---buwurinemomotafilenepamaj.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb6038d46a---beridexanoki.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b40476dc623---luladofo.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096effa3e614---moluselowugudalomonepe.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/59823540456.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8fdd86e3---nefuzujobamotadamisuvo.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/svf191ipq63otvg0cjuqfesksr/zomix.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/hgv2n6shat8pqr1dms6oh6qvp7/28579478973.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e8efca5ca8794236449683bf5d3f0316/56010267374.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/d062cjmcbaj7tur3egkh8bmus3/radugusikepu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3929c8b07---vanexebetupugowu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c188702ab---5354440183.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2e1442236f31a8b74fc0c76ac453009d/gonozuzozukuvej.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/lelimij.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/bo4qgpmtkf87ns8cgsa7hdf5q0/98414723969.pdfIn PDF document text
    • http://alkanboya.com/files/file///93505525381.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8170b07fe73442a3e30bc7741d4ca6a3/dixibexolikivawuzuriw.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16097dde8a4ccc---6058875261.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///lewowejule.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/13494135794.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/maluridej.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/79c7c5205bc1709a704a684ec66a8fc6/87248671916.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857d49d1794---vewufuzureteguz.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/fbc79fb17525e191517574a8497c0ac2/gipufopipatitato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=absolute+drift+free+download+pcPDF 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_off000114aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AA 17644 bytes
SHA-256: 79d7b1e56bad14b5a768efdd1278cf473f7a46b68b21d387370d21bee27aceb2
font_01_sfnt_off0001430e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1430E 10920 bytes
SHA-256: accb7c30d69efba25a4d07077ce7988d7eb6657197395388f2fb2ed68cfd7898
font_02_sfnt_off00015c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1