Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0ef754cf6f520f…

MALICIOUS

PDF

94.1 KB Created: 2021-07-03 20:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 98bfddc8c14101aa02be32f548bb21d2 SHA-1: 5719e9bdcbd8f73055d78abdaf193b9f5a57f80d SHA-256: 5f0ef754cf6f520f4279c1294e33687ef495cc50e04bd850ef05e274b33c7839
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of external URIs and link farms suggests an attempt to leverage compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074503f965cc---91970004561.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb26e2313---80795243058.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/78551986133.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ac41dd79---xavijitegarijezetak.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210619215716_786682298.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/fefutejumu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdaf170458---rozugi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609146508d434---niwomewixemorozijirige.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d68c8dc630---52900297862.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/51112841067.pdfIn PDF document text
    • https://loctra.net/userfiles/file/31684119374.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b978fc2ea42---kotavo.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/6b7f8f52934c57f0da30876399f1fc69/jezexorepalomezoximijufid.pdfIn PDF document text
    • http://51www.org/uploadfile/file/743c805fabdc326ebb5b18f940f0384c.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7241c65f5---minadusebugipiduxakaj.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3372614513f0ff05f64e980c82b3606d/9225542482.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7302be382---regixefenom.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb6819a9df---bopino.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/7997628450.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a78de55e58ef69717be43aa6e0c441b3/mivagizadit.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae833494a9f---68474377158.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c3e443197---98626601025.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/f334249434f7f120c1d882c49407ccbd/wumawowotisenavodazune.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/16675505860.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/1119fb9761adceab43dde52fdf4e017d/joxar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=trivialize+in+a+sentencePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 21468 bytes
SHA-256: 4915bf209070d80cdcfbebe746a5fe6720a2bf9879d7f52897a609e716ff90fc
font_01_sfnt_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 10192 bytes
SHA-256: f271c864b9ae446b96f71cba3cc46d246cc9d090420e98ac537d4d43789e9008
font_02_sfnt_off00012f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001474e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474E 16532 bytes
SHA-256: cbcd51d988ac50df892e27886868c963947b7fecb96021cf60ff40c0ad4c475b
font_04_sfnt_off00015e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E78 2724 bytes
SHA-256: 7f506324442b4ab30334e85a7056689aad81ecf145691c5badcd48b3b7d191c5

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