Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbba1c76683eb9e6…

MALICIOUS

PDF

92.3 KB Created: 2021-09-20 20:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d6150549ef281aa1acc8ddedd66f98dd SHA-1: 1e2d50a44f0fc9a168acbb8b54b11ea0812a9f49 SHA-256: cbba1c76683eb9e6bd88f415887b9b2962092fc8d4e561e190f8550476fc404e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites, consistent with phishing or malware distribution tactics. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=pgp+software+for+android PDF link annotation
    • https://krygina40.ru/UserFiles/File/xuledofijemaladirufekiga.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/xidefarafilodateleka.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29db4f332---jurot.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/51910364815.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/sijisizuluvorobej.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/juratopukanovimu.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/75296161022.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/84441956031.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/64999528756.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/98584406682.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614009ce60543---30565014321.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/kakediwonopi.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/lesarezipewiwopemef.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/pelutegonegejinit.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613908f09a7b3---jovupotubumor.pdfIn PDF document text
    • http://ipllaser.in/uploads/47508831198.pdfIn PDF document text
    • https://topupdana.com/contents/files/9428571931.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/nizuxetavofufe.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9f16568e---nabefototupawalotovolokut.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210905_B05334591F2DD14F.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/40498653825.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/lokivev.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_off000106f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F09 10716 bytes
SHA-256: 8b2eaadca617a9db99c4802b93232e06b396682e567b0dc69580766da7736dba
font_02_sfnt_off000137aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AA 16892 bytes
SHA-256: e22cb1b4ba630fb72142c5d1f513d7fb2f9a4c6b32b2944bf4bfcd4a9cd1114c