Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57a0bb27c33b2dc…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 11:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2ea4122b6217623349ad6142b7817fb6 SHA-1: f37b0bfb7f817a6d9eb501752e8dfe1a70bf4fdb SHA-256: b57a0bb27c33b2dc37b5ac9dfc7cbcd6f756c46b1070cc5dbdad7552a6a18c53
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://silverspringabw.com/uploads/files/zagixanarojov.pdf In PDF document text
    • http://contelex.it/userfiles/files/40251441157.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/6894922440.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/fapusomev.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ebb0baac13508f43ebe075569beb30dd/64666504769.pdfIn PDF document text
    • http://standardamulet.com/files/files/kekagavobawiwetuv.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/34549397493.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/62907648599.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/59876428350.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9dc32d4e8---vogofaterifebolinev.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/girewetozubake.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/kekigopuradolerexakotuk.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/52755208457.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/59230786412.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/xarixezetolijosoj.pdfIn PDF document text
    • http://fruitsad.pl/images/file/lawozoker.pdfIn PDF document text
    • http://101balkon.ru/upload/files/dupus.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/12522401115.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e41043f1e---buzamoxavojoda.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614072f817395---53158472407.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/kamibiga.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/saxuvelekezolomixenubinaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=doctor+who+7PDF 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_off0000b283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB283 17024 bytes
SHA-256: 7d8b45ebf3b8adf813d855d09f1a5bb1de852aebff3015f78b60cd2b9716cb13
font_01_sfnt_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 9760 bytes
SHA-256: 72ce82aa179b04aa0a7cde3708b27a29eb52cc2f80493295c5afb14fcd3f7ab3