Malicious PDF — malware analysis report

Static analysis result for SHA-256 751ac158debc9e76…

MALICIOUS

PDF

72.7 KB Created: 2021-08-27 13:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 305dd09df7fe8f0088487eac291da7ff SHA-1: 93577130800904f3cbc7c39d8edcdab366b3cbed SHA-256: 751ac158debc9e76e0ad5ff32d08bdf7fc874e0ee593caeb3b594282e4c51b26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an intent to redirect users to malicious content. The presence of external URIs and link farms on compromised CMS uploads indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=implicit+differentiation+to+find+equation+of+tangent+line PDF link annotation
    • http://allseasonsart.com/uploads/fck_uploads/file/24701869779.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/mefet.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/ruguwujuxibagejiju.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/59355964822.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccce2b7cdd---70090735667.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/sitarixesuxotudoxulexeluk.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/bapexukuzivus.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/fasepaloxularadonovilufa.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d24ba6c9c99---mefaju.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/67188264078.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/rojakimo.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d2f006f98---7115695738.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2d2f6724b---wuboxopanevitajedoboguv.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/tia00ojlf6guj3d21t7rhubu0u/60566843491.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021082515384873499.pdfIn PDF document text
    • https://ms02bet.net/contents//files/66724621372.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/nekemizetagujifitufof.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/73619218800.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/21772147863.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/74b95d932d144f2e6b0d08173594d9f7/genesimala.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ebb1c576e59a8473eee518a0da03eb92/nomomibuxaritojepuzomora.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/94991567894.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_off0000b9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FD 16140 bytes
SHA-256: 54d3095f56cad957bbda5024386d0e3e26943d137b32c6579610b7be20e3d2f5
font_01_sfnt_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 10992 bytes
SHA-256: af8a301fa6b63a496db05c9e5f1c4bbce5aa5f4df6df27287bd8048dd15eee07
font_02_sfnt_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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