Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfaf9acf9dbf714…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 05:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e611489c106ed9d8bdecd7e0f5ed5b05 SHA-1: 5790fef8aa30a3246667eb987ef9338eaa625f58 SHA-256: abfaf9acf9dbf7141c1199f0c0dc61bd2aeb7c659d17a3cb46fb19307f6576b1
104 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment. The document's purpose appears to be redirecting users to potentially harmful or misleading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/62ac583c44a089f48209fb98f05d15f1/74613921580.pdf In PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/alrm7kq8tdf5n0fu9mlap7t530/4031532541.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/49755515526.pdfIn PDF document text
    • https://proxus.nl/file/vufoziwejipolixun.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/89003628178.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1610431179bd3c---82928033331.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/47018897877.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/21460874748.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/nubigob.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021071616332638.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/92822025004.pdfIn PDF document text
    • http://absigorta.come/file/leron.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/6155190437.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/pepadukak.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088ec94c8df4---fejikosuminisidu.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/bukezalitukip.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d774944e3---87809122355.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/99136328590.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c968e20e001b30740aa6bc85a3bc6cec/filizezu.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/pefesurulesegezunalenesa.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/jugixuve.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/segogabovigip.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/2726822564.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e888dd704---72779967064.pdfIn PDF document text
    • https://magnificenttreks.com/userfiles/file/kovesegilupivuvavaxini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=embedded+systems+mcq+questions+answers+pdfPDF 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_off0000dc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 17752 bytes
SHA-256: aeb943581c62879a0f3b470660792dc8bdcf4d300d6bed5e88f25ab6e371b98d
font_02_sfnt_off00012204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12204 11304 bytes
SHA-256: da9afa67a7922ebd117269728c4af199bfe4d88cfe8e91fb13e4076069fe42c0