Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ffabff12d9fb5f…

MALICIOUS

PDF

89.6 KB Created: 2021-08-16 11:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4112177ffe641f8d1d021eedb4bc5521 SHA-1: 43defb2b8cd93e350fb633aabc2c289c54a160fd SHA-256: a7ffabff12d9fb5faa30069b25815a1be92ce8522851bc4169851e142a1055a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection and ML classification further support its malicious nature, likely serving as a phishing or SEO poisoning lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=1000+canciones+y+acordes+de+guitarra+pdf+gratis+descargar PDF link annotation
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab69034ab21---94980250535.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/87549820992.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a952e3a8ee4---93017854784.pdfIn PDF document text
    • http://skomi.ru/img/files/file/43895069247.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948b6baa68f---risujeverekugexepa.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd749eadbe1---tozoxosijizogalal.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b881d026f45333150b317d5c178e9045/manebutujem.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/qvac2189nqec5p4p8eqkpfthkd/meroluzaniveledo.pdfIn PDF document text
    • https://digireg.es/upload/65319334167.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/5011097614.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/93040793513.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa463e344---fefaxo.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/5i7uivd8ovdka7sh2s4agvui1d/vizejuduminugowovijodawon.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/50072699669.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/40118418250.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3b2987e46---menemapesebagikijonolenir.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/tituvoxazi.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/69976382853.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e5e3eeffcc4c9392064cd4f07353347b/winenexixusiforedojorolu.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/67728375125.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d8f90bca---87103788166.pdfIn PDF document text
    • http://weingut-suppan.at/files/40607049618.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/xijasovowawiduv.pdfIn PDF document text
    • https://europartner2.pl/uploads/xunegeturul.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_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 19068 bytes
SHA-256: 9472bf35490296742a734b607e802c359167f1a8d924a042db039305db13c126
font_01_sfnt_off0001247d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C94 11040 bytes
SHA-256: 60a344692bd0eb1b78b4594636983e0b1eb1eb70971e4493cf7f6e92bc1068c5