Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3ac52c67a59ea7…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 15:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 801796d28cb6e9e5230ac2bab99ecf62 SHA-1: 0844348775a785d75c7f326d80e0d9bc6342622f SHA-256: be3ac52c67a59ea7c67cefd3c1ac7cafa21ebd65e3d369311e4b960595ab5a89
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 5

  • 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 http://tai-yang.tw/taiyang/upload/file/numedufejo.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949ef9106ec---21698284088.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/lariguvu.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/vipexopejemawuvosobubiju.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/561f41e038cb4563c5c77bd8556437cc/85770423531.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/1530717754.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/86bf57f39e6b715c3ea7779eb184b7d9/39475850907.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/44957054005.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/wufava.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160814e2d131dc---kekuxejaxemaligitupinuk.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/sonowajaj.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/49138613496.pdfIn PDF document text
    • https://austarpharma.com/upload/files/70885894008.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/19ed26c4fa7da08de85e4da1fbe2d491/batomamixigataf.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1jj3c6eo3dv6jv99e1gpv5d751/basaj.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/xufus.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/58487966875.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e12a61adbef---porarofeluvepoxel.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/81284750046.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/14379156017.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8775b41087---7889365353.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/kusakaw.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5caa8d45---85760620547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=petal+pushers+flower+feud+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C5 20240 bytes
SHA-256: c533c08b07e504b39606de2f5dc2ca5d5c26ab747f67289d85f6d1f9de3203a8
font_01_sfnt_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off0000fcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 10588 bytes
SHA-256: 45222e9b58711c5508a41ee2f56d6adab2d65e9c9ceaaa59f5f44526b7d82b1e
font_03_sfnt_off00011539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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