Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d69c6bcb98dbe5…

MALICIOUS

PDF

86.6 KB Created: 2021-09-04 10:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 63acf8e773700dba29ee13406bb993d0 SHA-1: e1779beaa49ec8f2b011484026cc0a6fbb2caaec SHA-256: c5d69c6bcb98dbe56dd3af396a550d62f26607901b75d88aae4166343c94eb8d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This suggests a tactic to distribute further malicious content or engage in SEO manipulation.

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://apartmaji-zunicmile.com/uporabnik/file/tusikulaso.pdf In PDF document text
    • https://projetounificado.com/uploads/files/65847781003.pdfIn PDF document text
    • http://fullx.net/files/mopozozupisafiwap.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/mawogunamolawolufisaw.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/84090790536.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2dfae730---jokusiwukobubal.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a377b2c02---zisigekorebibatejeli.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/newagugafeb.pdfIn PDF document text
    • https://soechi.com/userfiles/file/18145802080.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/gimenamiwalugulutepuneguv.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf373a695---repex.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2cf8c1b9e---debusajujavasopojezivivap.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb6e2f065f---39453600792.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a1d2747f402a2d693412d69737500fca/74174820595.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/96755298474.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072dbe9ad06c---kolepigag.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-4/20210904060134999996.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5bb78bb56---1458449087.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/kivojilaxaravexatifufaga.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/dadilimekifeka.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/sasuvarekasibukirum.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/pipasuzubekumojerit.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abdf981c01---55212962514.pdfIn PDF document text
    • http://dejede.com/userfiles/file/junasubomosaguzotik.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/20641942814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=french+adverbs+of+quantity+exercises+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_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 19404 bytes
SHA-256: d34cf02dfb90eef3830207d003a2a946bb46c1d2f978e37459d5ed0c3a8cb103
font_02_sfnt_off00013007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13007 11316 bytes
SHA-256: bddfa9c4f24c9432c457c2227f09c8db717ecf85f9052d04cb3907396163825d

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