Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c93badfb52ef8e…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 00:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2fa42d8af31c882ea4942745a32b4183 SHA-1: 73ccc201c62b49b003a790042feb6e5b07330e70 SHA-256: d1c93badfb52ef8eb2e6f376f59c0bdf9418b0ee66aa860a87fb2d28feca8569
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=guardianes+de+la+ciudadela+pdf+descargar PDF link annotation
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/1afca006a4cb9a735e7ee7fd286b5971/72167262857.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/tilepukawubem.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/24038919686.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/paronefakeremojinidawo.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/sukedebigibu.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/6347c55574bc2eb01c89087e06ec9fb2/23298572028.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161267b731f506---17577504795.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1611567935e016---surabexika.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1611345f85d670---79222655476.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ecd15fe6d---rimutelewutoti.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/gopejilimajinova.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a45d57deb1a---dopinojosopixit.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/walemode.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0310b113c---82972755611.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/rebedelapibogaf.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021062721445373499.pdfIn PDF document text
    • http://veitali.com/upload/files/dumafikijoloniv.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa89a48dac---jinebejenusanafa.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/edf5f9a6bea9a890c1913faf950f9c11/zomejapakulotedo.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/9383554584.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/897d238a12504aaeae2008a45c61d33e/biwab.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-31/20210731101405638552.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/tazoxinigenuseki.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/60917229479.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_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 20200 bytes
SHA-256: d735b99960d5c454db7eb2cfd6f090ccdaf640c64e15ab7825b37d3d3b0d884d
font_01_sfnt_off0001145b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145B 10716 bytes
SHA-256: 9b7784362f4f97c1602deb2b7c1f424c176cd6d98eef6acc3e752889e046f61b
font_02_sfnt_off00012cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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