Malicious PDF — malware analysis report

Static analysis result for SHA-256 425a7af650bba626…

MALICIOUS

PDF

85.9 KB Created: 2021-08-07 07:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9903e8556e7395f9bd9dba2104b35206 SHA-1: 41e77ca5e658bc41768f2712b1b44157dae2f2d2 SHA-256: 425a7af650bba62608e6190e5f58d61746ee97a99cedccaf72043c0a8ba6896c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm, with many URLs pointing to websites hosted on compromised CMS platforms, including WordPress. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b6608e5f0cc73106023af1ffeecb8288/tixuwegariwanuwoxogilezu.pdf In PDF document text
    • https://actaviaserica.org/board/file/files/lipodi.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081ecb7bd688---49351685529.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/vixozupepa.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/7ce0f877f09262ba9dc897dad2c6dbbf/68119024796.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/kogaduvin.pdfIn PDF document text
    • https://digireg.org/upload/62431875516.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/gabajabetidoka.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/jukidegad.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/40523985194.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4f64c9647---11299012687.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/48133718302.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a3c7096bd61967048b9c8c47da38921d/45373259252.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/kifobe.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210624030033_alrlfv.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210621204715_i7yzf5.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/08b60924d05d735d483eee1c25cacd93/juwedulubofisagawodusu.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e40f54a75---busumozelixusuzitob.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/gemutifuxinugobil.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/42460339098.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/o038b8kt3tuuhvm7b7t6aobgl5/bisezuwarofo.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/18606793238.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tipebopegowagosexi.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/50948388116.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/lozibiz.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/28302627434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=convert+cabrillo+file+to+adifPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 17320 bytes
SHA-256: 7d783721780e852e12ab030599a6f244cc1346742a79223a273435be905618b2
font_01_sfnt_off00011916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11916 10540 bytes
SHA-256: 5cd0c37b0b729b7b34fc1e197fd57c45d17a3af63ed5e1c0d9832d0c0e8025c5
font_02_sfnt_off00013143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1