Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd524fe7176972a…

MALICIOUS

PDF

93.0 KB Created: 2021-07-31 02:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1f095e1de67dcb2f6283712cbb384785 SHA-1: dd5ff0d318f0712fd26e8544eb5033340fc0c84d SHA-256: 2dd524fe7176972a12084ac05b30ebeec20952f1704a030e03f3734f0dc92375
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://quickvideo.nl/userfiles/file/43739796897.pdf In PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qcajuguasdq57ihgobmo2fkdo/32287118132.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/jd2onntbpgsksn3lfij8ghj95i/26684750401.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/cdfe4d49be55156b71ac51ca8bb4ace4/87688581002.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd3543c921---sivujuzafoxis.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/gopajabodebepuviwowumowa.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/pedufubopowebugiwetoraf.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/57566623688.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a5e02e91f34a1185e06565da418d339/jivafeverotimowogene.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c0fad326---xotukaxukagirevixozalolox.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/pupoxisili.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/408cd84418c9377172a7abd15db81c52/buxisisezekibe.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/dozubufo.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/49562752659.pdfIn PDF document text
    • https://mmszke.hu/files/file/zetide.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/70278878481.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/dapegoxilizagivelowezep.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/57502729849.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5b0ebfaba---naporofalisufuwofeso.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817fa1b6922---jinewibixanozanosokitado.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/85929541199.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/72679044234.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/vinuporajawadolageb.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/79hn152afruake3hlqupbsl4bc/25224585843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dragon+age+inquisition+staff+grip+schematicsPDF 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_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 18724 bytes
SHA-256: 4de94529f5bc80f7c782165d45ea4d221242252bfa6e4e208da09457172c4804
font_01_sfnt_off00013469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13469 11128 bytes
SHA-256: ae8f6f492dc43da875c10e2b178dbf101a74abbc2b9d544834e0e5a2c4cdab23
font_02_sfnt_off00014de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1