Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b7dee746524a68…

MALICIOUS

PDF

77.9 KB Created: 2021-06-28 23:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91837d1a926fa1f4499873ecaa935477 SHA-1: fed2b62d72ae1c198fecdaec145451088cca4b90 SHA-256: a6b7dee746524a687709f3aef50d98be4256273765f83b67c1b0932e3a618256
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to contain embedded URLs, suggesting it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crysiq.ru/uplcv?utm_term=acres+mere+green
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a042a53940f69ad9d7e4e377c20826ad/wavabiniba.pdf
    • http://pivotal-technologies.com/userfiles/file/40403084151.pdf
    • https://aimara-bg.com/userfiles/file/tulox.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49a63c33d8---43628034363.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a00f7d316ad667c74c7406c1042e35a8/22378993981.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d97b7ead2736401cb48d3e85f82fed98/99200726465.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f54f1c05---1518072400.pdf
    • http://www.companyforte.com/imagenes/editor/file/megukipobusuwetebuwozol.pdf
    • http://tourister.kr/userfiles/file/subikepuwida.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160749c27ee4a1---rovixovutabeloxefaborap.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/i8q625ikf76s0ineq30nv9bt8m/14878969791.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911578989b0---50972248260.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88b53f509---womujozavebipuletoxewek.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/316ue8en0a0m32te3njubc9q4p/12960139299.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af0e38877b6---70621902596.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/gj59nbqaiatg22ts0bhccaffup/donakojuwaku.pdf
    • http://indel.sk/userfiles/file/vikimugobavasegeriwaja.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0a311acc8---madipunimezixusesiw.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/80266888711.pdf
    • https://akproauto.net/nbloom/fckuploads/file/zujupisopejurove.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a279269be21---gavefaj.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/1638f85c161b9d5042deb4400b4e9b56/88036168201.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d679d6ea7c5---25750223869.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f209ce1ed9---mizaxujapamesavogiregesul.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d002.bin
3db6e0f246915b5c3bf830cf55382c7b2f3ae14c87fbee6f0a135eff91f7c60b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD002 10036 bytes
font_01_sfnt_off0000e64a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 16792 bytes
font_02_sfnt_off0000fe5c.bin
b3be5a683e4ad133ca095f961e0a9234fcd9522d1978ca3d847236c6403fe6dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 16988 bytes

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