Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5e02191ebeba41…

MALICIOUS

PDF

91.5 KB Created: 2021-09-07 21:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 010c4bddd88457b468a80ad7c5e77f49 SHA-1: 0398392c3599f9567b77866a231dd65178d8828a SHA-256: 8e5e02191ebeba4184c41809b9b1a793a87fd1cb3548f5077a6dd7781d947aa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The document body is unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.karelo.com/uploads/File/sazimefevezaxerena.pdf In PDF document text
    • http://kayapaliinsaat.net/file/xaregobanijofugojoxi.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/59g9eiu0igukhr6a8bacrg55gg/votinekupujuzanif.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a44455c95ef6c048509da94b93d0e161/virixejo.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/6379000352.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/vafotibavedaselofima.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/1350703627.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/22862886911.pdfIn PDF document text
    • https://aneri12.cz/res/file/dawerejufatixowonefutulow.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/sg9brh0n8ldgv2atlmu2tvrcbi/20860984960.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a09213b2d4---60056234297.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608254589806a---paresatufifujalevazo.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/faser.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/20733748411.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16095af3ea7ce6---68221311764.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/bd56a9698fa89f029281d8344da201e9/lebezeriminubutoxazerabi.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfabf2ea6a---fajiwijotuwovazumurozoz.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/jozutegitov.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/f46rg3cj59st1jlqnuejf1lb82/671760243.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3d139d014---pinuwutonapofasif.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/2fqbv9jc3uhq1c4tabk8u6h4v5/24441366037.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/29294868600.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d94dd604---72941581919.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/pamusugavabafetal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=metric+measures+worksheet+tesPDF 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_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 18072 bytes
SHA-256: 5b0468dd93947bf4438bbcc4ab43f1fc439072ebca086b510dfedbae925910fb
font_01_sfnt_off00012e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5F 10616 bytes
SHA-256: d4a2fef116fdba10015ef74f195632f6f44c3e06af17f046e4fe94989e188269
font_02_sfnt_off000146cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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