Malicious PDF — malware analysis report

Static analysis result for SHA-256 076a8cb079db693c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 10:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a4fa7464b9c3e771ee1cdb8e62e7de1 SHA-1: e06b31f9fb8bbb02d79f9fba816c9945963cfb23 SHA-256: 076a8cb079db693ce0771102a719c08478981411cf59784c3bf8f6b7a2441197
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and heuristics indicate it functions as a link farm, directing users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://inwebjor.ru/uplcv?utm_term=convert+photo+to+qr+code PDF link annotation
    • http://sisparts.pl/zdjecia/fck/file/lojulufefikexagale.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/gitulufipumase.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/wetesubiverusuwegujugiw.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/kupobitixax.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/mofekesit.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/56793862033.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136121703ada---70174102973.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/jizaxuroribari.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436f562aa6d---39049174778.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161425e4b42086---977428187.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/82177087056.pdfIn PDF document text
    • https://makenie.com/upload/files/25818720379.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161341aacb77d4---10333567234.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/zoruze.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/192j5s9dmdif7ed52rpagb4h6i/3865005749.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210920034531.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/wozokewuguresuluga.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/12385670381.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/matijozavonazana.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/26186349103.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/lolipeperupim.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16148083f38542---56060755714.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/49048820954.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/nilojabedukimufodebuvan.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_off0000dfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 17112 bytes
SHA-256: 4240047a55603b1ecf2588eb621cbc4345b3ca121fd8dee2bc6b691934e34b8c
font_01_sfnt_off00010c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12481 10388 bytes
SHA-256: 59e63e65cf27e255f024430aa12f85f138a07299c2178024dc5e604eb3902348

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