Malicious PDF — malware analysis report

Static analysis result for SHA-256 899a3ff4284284c7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 13:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d4aaf77a9b35672110f9dcddbe4d7f5 SHA-1: 7f1ce6acc4362d5e0ac9f7817fdaf4be9f85288d SHA-256: 899a3ff4284284c7a85bfb72008c9696d4263596ad42a25c77f8f45622ca0b4e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://laborke.ru/uplcv?utm_term=jcb+535+140+operator%27s+manual+pdf PDF link annotation
    • http://nessie-vinylcare.com/file/64791168195.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e4fa23c86---bikidinaweruwobalod.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/798f64b82bd5c5cc9961502fed20e182/33167732343.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tamokela.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/397d55eb67a90310a081000406762542/24619121265.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/33517191318.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/35771421378.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b53626d61---9784156849.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd87ecc0f4---tudikobikekeruna.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fab58ebffec---36726164341.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/vefuguj.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/kdr4roklenhfcnnajco3pfru24/dekufugowalo.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/dudanidowupowebejot.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/zujapawolovuner.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a6e2e9435---95112688307.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16079215097caf---tozepisomuvifalodosedi.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16ee358f27---mojiwawanexopebob.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/mavon.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/bojoxuwafakojaxofe.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16120491ee63c8---duwofinularetejuxovi.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/33374600035.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/jpgicr5r9g72bq7v2riq7j3lt6/runosobuponasuxegejexug.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/99167026365.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/48504688936.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/66249218082.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/95eefa82cac70d755830ea364c15315c/40904484980.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_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 17992 bytes
SHA-256: d3adeecba9bda8ab3bcef04d172644baa4f2bb9222ca26d8acd0a2ece6379b86
font_02_sfnt_off00012148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12148 11512 bytes
SHA-256: 695a4c47101e1291a81dd8ed691e1dcc8abb0ce2b824c8a163a7bb4444c75782

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