Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fecee02c1f4a0f8…

MALICIOUS

PDF

82.6 KB Created: 2021-10-05 07:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 48d6296ea1770a91fc0a05165ad149f2 SHA-1: 648a977165157048a87a5c9ed214bc8b07dd84da SHA-256: 1fecee02c1f4a0f830115b0cfc4848b1d4a390098831a46664dfa60d36e838fc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for phishing and malware distribution. Heuristics indicate the PDF is designed to host external links, with ML and ClamAV classifiers strongly flagging it as malicious. The presence of numerous unknown URLs suggests a broad attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.farmaciapenil.es/userfiles/files/kulonegogipenedanimopa.pdf In PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20211003_433112CBDDD72079.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/36699088713.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/10046303725.pdfIn PDF document text
    • http://kant21.com/userData/board/file/7642960987.pdfIn PDF document text
    • https://blogsma.com/files/vafuf.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/mutevativ.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/95110333350.pdfIn PDF document text
    • http://grancanariacomercio.com/documentos/file/8296049543.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/ff1a4edeff7f7f06515fd5c024c38f86/48382001350.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/fadedepipelubikoxi.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/34316182948.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/xaruxomotamozajazodofup.pdfIn PDF document text
    • http://pb-book.com/user_file/file/22381642342.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/bd792b5d97ed82a7b67bd17d90f9d128/sinadedadogivativavuza.pdfIn PDF document text
    • https://gdaniec.com/upload/files/gesav.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/lagojexubipunukuvu.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/36781747770.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/54967205957.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/th4i0okujdq7o73rsgqkkh7p96/vasotepidoxa.pdfIn PDF document text
    • https://granitnet.hu/editor_up/51038174222.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/46855743800.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/18112036488.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/cc402c50c436ed89ff955a9d87fb5aae/48005615315.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/85597335901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=note+3+root+without+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_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 18416 bytes
SHA-256: 77582cd7ee138876f4fa7d6aefeb1f5f5732f106b125304e2023e840a74d983c
font_01_sfnt_off00010cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 10328 bytes
SHA-256: f6de858eb4b37d116f1a327879cfce110e9e103042787505c21742bf0e5871af
font_02_sfnt_off00012480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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