Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d6f8c5b593b889…

MALICIOUS

PDF

85.9 KB Created: 2021-07-15 20:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4cf9d8d4caaf039214076a70c2333343 SHA-1: f2b629c4b7ebbc6e93a12b854eb542cc3e3f4767 SHA-256: 86d6f8c5b593b889aa28fdffe189b11a8c9cb525ad99b564da37dfe8378cd75a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. This pattern is commonly used to redirect users to phishing sites or download further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=fais+general+code+of+conduct+2020 PDF link annotation
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/vuzoroxufesoxawixuk.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e6b424f7dba013090a94065d60d553cf/gatuk.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac749ae66d4---nafovifalogezen.pdfIn PDF document text
    • http://vce34.ru/attachments/file/ronaxufariroza.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/bogenolibosamed.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/novudozesebibi.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/79640408879.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7b53c06c---27519051984.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/77269912000.pdfIn PDF document text
    • http://iccarrentals.com/files/file/mijizogejineloz.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/obb872egtf6jct98emv775gm9b/ramobad.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/rumutaxorojomav.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/50107639393.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/kakise.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1734d45a---sisalez.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/zikigerivujugorigopitaf.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987a797a096---32205974158.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a1b6a5e19---3914623956.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afde83b2c52---12295775635.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/158d241cb5c82e5f0b5669435b09fd9c/23071085854.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160871501ec99a---61115995345.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/komasosadep.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0a9e6a26372f67910f63048181fc156a/41123518174.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e6df7f7bb7f---kewamegelugibapiraxoke.pdfIn PDF document text
    • https://harom.ro/files/file/26513053121.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_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 10968 bytes
SHA-256: d8c831b2690c4b20efbce3590f498daaaff80e918d456c6b15332f50ddf3e111
font_01_sfnt_off000106df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF1 16912 bytes
SHA-256: 4c6a0d662ed0668bf23c46912d0170b23cd7b337173731213fc07d6eefaf7780

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