Malicious PDF — malware analysis report

Static analysis result for SHA-256 713a2e7e228ad2c5…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 03:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 716546fbec45aacfa51941c4d47e0115 SHA-1: 5e5a0235cee68dde6698e96d37e0ce5f4a0169fd SHA-256: 713a2e7e228ad2c5e745e44102e419e46730a4e190abaee5c674a2f7d4c1e48a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=the+riddle+of+latin+america+pdf PDF link annotation
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/52585292481.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210627_A6D41DA137D17C26.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/fapodosemivuvirezako.pdfIn PDF document text
    • https://designclarf.it/file/vepesuganakiga.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/8741900354.pdfIn PDF document text
    • http://bkmjg.com/images/upload/File/10895486617.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/02873bc9ee2acefce11c696e07d046f1/50779089615.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/gujogukegafurimuguvumig.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/mijaligavigox.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/sewosevaxativalenadikubel.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/62601739498.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d17687afecf11bca810aa33c4a931932/xojomi.pdfIn PDF document text
    • http://delve-cr.com/uploads/lalup.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/aucdi3kc1ta16mbq9g6p3eoru6/7359951089.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/nipejefav.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/rumanodoxemolufuzakib.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f23bcdfedf---mosowumeniwuga.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/seo72d9ci5b5skfs7is34hqjbq/nejosonuvadifuze.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/vodusuwupetetonalanote.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/sulejuludugajapewefeliwi.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/vegajavamekikaralotodixok.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f806eb6a0---18927138611.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20218232214192131.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078ef88174d5---ginitaligojosesab.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_off0000cb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB37 10680 bytes
SHA-256: 007077fbaa612b362cfd0fe7b1d47a30341b09ad3f2c72ed23feaa37978e575c
font_01_sfnt_off0000e36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 17784 bytes
SHA-256: ebe89fd72564921c97d0c308614656dbc50c3e887fe167b65faf3387033e3331
font_02_sfnt_off000111ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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