Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a9adafdc24a676…

MALICIOUS

PDF

79.2 KB Created: 2021-08-29 00:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fdfce7c387f81bbb6e76a2fa9294f52a SHA-1: d155c3614c55b5a2b04196b3b1a67b5b5d6af39b SHA-256: c0a9adafdc24a67679abe184f1078681dc009bdab43f5134b4e008c3d2f9a033
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to manipulate search engine rankings or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://ketchas.ru/uplcv?utm_term=practice+sig+codes+for+pharmacy PDF link annotation
    • http://allycatering.com/userfiles/68241493751.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/5c45d0d287079bbad81980484f70d9ec/15471448344.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/12602547006.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc46ab5600---nozimabazete.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/eb5c3282ab52889aed469649911c3b2c/92052310339.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/75353922562.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97945b6e1---xikadaxonepigekupuri.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/msqolkelgnpgima5ltvooqfenq/80448075110.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec5db704d---7288911367.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/bukolamuzamudivub.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210730005126.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/fuburug.pdfIn PDF document text
    • http://falerisztika.hu/tmp/14097143179.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/3mgf21okm284sqe8svh00ij5i2/mawalupudopimisetujopemi.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/60496878152.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dedda9fcb---filiru.pdfIn PDF document text
    • http://uco-kampen.com/media/files/jafopotaxomudozexaxob.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081f1c383468---butifexigimamesowege.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/21111031177.pdfIn PDF document text
    • http://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/vebotaxa.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/zatadafazega.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_off0000cea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA9 18180 bytes
SHA-256: 3d912195cf007a753d2696317f0c60d25f13a04b6af1c7155101f98d09178325
font_01_sfnt_off0000fdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C6 11032 bytes
SHA-256: 0c590059d76c66a0fe91967e72a9ff4f0a63311f26a2c6001dad6915bc62ddeb