Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb5d73b8e894821…

MALICIOUS

PDF

68.7 KB Created: 2021-09-13 02:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de5604ea24748caa5ed9fc252c24d503 SHA-1: 53de0823a8dc76dfee5b0c7ff123c7c4e966762d SHA-256: deb5d73b8e894821c95e932ac03228c3c6e984d34713de68804bccad59869570
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document functions as a phishing lure, presenting a screenshot to obscure clickable links. The embedded links, identified as a link farm, point to compromised WordPress sites hosting further malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03ca02138---81336093756.pdf In PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e56b9e0704fe0f86b3a1f539c811ff55/temodojatodigufup.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/54296259919.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/nobovokatebo.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/25640129283.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139dfb0cf789---87551489091.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/numudoxifafutubojasa.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/67100512010.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/17712829770.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/pofadudaloguwufebifufa.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161396f2ac14a5---fopeduterogetavesatine.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7432ed016659129018a37b528b18a93c/75139673375.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/59357523690.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/74305146899.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/69957721309.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210911043759.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/virumejofewipika.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/kudasaja.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce2b341f59---rokugoniseruzivejilobe.pdfIn PDF document text
    • https://ever-progress.com/upload/files/78258662010.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/majapabetunarovenuxinezik.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/60634313326.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/51847342997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+go+how+to+get+pokemon+coinsPDF 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_off0000b202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA19 10692 bytes
SHA-256: 5c8c225865cfab630d0434d1d23e6d3b929d9fb66b0345457f319e551219153c
font_02_sfnt_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 14076 bytes
SHA-256: 3caa2915b014c78e272750f6c9783f5d1207c83aeab668011c619cb1d086f9a5