Malicious PDF — malware analysis report

Static analysis result for SHA-256 db77d44873213bb8…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 14:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c34a2be33ad8bbf82ad007c56f01c986 SHA-1: 882da7fab94d198fe9061791943daee355f089a3 SHA-256: db77d44873213bb888f2086a138f94d169a10643471829204698904eedc39ee4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a phishing trojan, with a high ML score and ClamAV detection. The document body is heavily obfuscated, but the presence of numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicates a phishing or redirection attempt. No scripts were extracted, but the overall structure and heuristic firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bank-kredit.at/ckfinder/userfiles/files/92721878955.pdf In PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/84b3cc784dc52a1f0cde3c2ee5e708a5/xiwuzejesarofufonero.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/48757352578.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/41308135609.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/67320298518.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/86000308250.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf948018fa---22174659192.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/kanewukuxumu.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/46213204946.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/59336366724.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/jaronaboketukem.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d2a933df4---lekevigamerizubigobeserex.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/baneveluvuw.pdfIn PDF document text
    • https://domilot.com/uploader/files/20431660617.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/71749883061.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/dozirejofirag.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/35778753596.pdfIn PDF document text
    • http://fructusartis.com/i/File/90158496313.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/fb41c830069dc9867ab582746a9b5fce/7418554431.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad92c06be---wepologuwunima.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/262c3e872239baaac109d7af60a62b93/karokinopije.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/73220331907.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/21229840294.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7818cf5d6---liludoxamujamamunop.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/pajusonutufojobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=wonder+woman+1984+full+moviePDF 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_off0000b509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB509 11000 bytes
SHA-256: 542d1311860721aa5ce7feb8eddfd0e9328c8d889eee45cdf2aac4830906eb7c
font_01_sfnt_off0000ceb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C5 16652 bytes
SHA-256: 7c9af268ce775ab397be76d675e0ea5ce4b9253375d00d1a8e25533b3ec902be

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