Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84dabb6949fbb10…

MALICIOUS

PDF

93.4 KB Created: 2021-09-01 20:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ae8e8ea8fff1530e1628bb790efffe2 SHA-1: 216061b83cf0da4e8920e86d223961e22d285d4e SHA-256: f84dabb6949fbb100b41067f15ea901ef895cee61ae073e2d1f74936d639c13b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised websites, likely intended to redirect the user to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a sophisticated effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://accessibilite-salle-eau.com/ckfinder/userfiles/files/83710285161.pdf In PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/kujikajizanebebam.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/c89300516b9f65d618811346563858c0/87146232879.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/gunamowudogom.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f800a38cf4987bc3d90581d1e0ec3604/polazitodexunitito.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/majibugikoluviwawusefoke.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160856097240a6---46811141166.pdfIn PDF document text
    • https://fong-cai.com/upload/files/83582379324.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/48371281739.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0af83338a5---81597255601.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608406bad612f---vagefatomubebidotoxaxuxuz.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1d758d4d3---99069856159.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/11517720978.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/gm48gda02iq53u6f6tqvcctk14/bitarujapomaferemusosum.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609835f49fcc2---28014775846.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f90a80353ac39ea1d80d04bc6f2f5465/nezal.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210822043546_1920278389.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/wugabagumebirigu.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/1672740190.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160e41dde1ea6e---60009847225.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/14531978017.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0bb8bf99a---zizipivewo.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/maxorizuvofogan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=scared+to+be+alone+at+nightPDF link annotation
    • https://doi.org/10.1007/978-94-0In 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_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0A 10696 bytes
SHA-256: 200d5cc66e346a700e1820f60bc44b93fdd37129db1553c922bb7a39932af610
font_02_sfnt_off0001373f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373F 18796 bytes
SHA-256: 49bc6796e6a65f735f77642d65c10a0033960fc0673c4311faf6150d2aeb2e5a

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