Malicious PDF — malware analysis report

Static analysis result for SHA-256 eded9fd7f426e3ac…

MALICIOUS

PDF

92.5 KB Created: 2021-09-20 09:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2dba5461abbb1025210a8c86cd91d4a SHA-1: 6e7ab23579b613e15b5803e558b777bc4fe759eb SHA-256: eded9fd7f426e3ac5e513c28312f2d2d5ecb6cc6caae35dcf60d54a134afd1c8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://crewmak.ru/uplcv?utm_term=whatever+it+takes+movie+full+movie PDF link annotation
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145932747e47---20048675633.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/84220645451.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/xuzotidavitudigumidiso.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/koxefuju.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/21336848671.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613929a03a3b9---33422136318.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/62712074969.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/3855045447.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133c44a147fa---pujamakemew.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/27407173454.pdfIn PDF document text
    • http://lblussana.it/images/file/mowanusuja.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/duvugiwugojijevuraxipi.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/bunakarozanogomu.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/95837852526.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/navitizoguzakamofukesinub.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/93171469207.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/vizilumikeme.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/72166349980.pdfIn PDF document text
    • http://charontrade.hu/data/file/zezapazenixenare.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/fexoturizoperulat.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/bidiseboxugifamasaxe.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/tcs3g5n9habachuffm7v8ujja3/23455301591.pdfIn PDF document text
    • https://protrialse.eu/files/files/tepukilofa.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/nuxupefoxekagexurotego.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/juguxol.pdfIn PDF document text
    • 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_off00010702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F19 10624 bytes
SHA-256: b90917fe801056ca963beebed9a976a261ee28d25c9e12c2a3f92e14c66848c4
font_02_sfnt_off0001376f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376F 17228 bytes
SHA-256: 4e6ecbe85584c859088a17af0dbe1657d4717df775a92ff022ea5f99052af11a

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