Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f40001e9eb20527…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 04:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bcaa3a84b3b47f417cb1f3deec7f5650 SHA-1: af22261fe9c990febd09e4e1594d9b827dac583f SHA-256: 1f40001e9eb20527556c16f8741cf3eb441eca98dba7cbfbda0f0ee053743f3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised CMS upload storage, suggesting it's part of a phishing or scam campaign designed to trick users into downloading further malicious content. No scripts were extracted, but the presence of numerous external links and the overall detection profile strongly suggest a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f60bc7588---kemig.pdf In PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/7372896218.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16103b01577fbd---rusowiwelefikotixo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a90b760977f---nalumuvujibemezugimegid.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/60972809848.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/gje6fkg596tuhdiced95odkls3/relezetozivosituzujuxu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160723243580f1---18729064090.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/dc537f26e1cd2e694aba3255f8ae632c/87515835679.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/213444dbe3d025d5b32a17a31474effa/xotak.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/zexaluradubibefas.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ba39b045818153658b82da9b1f627e81/85712128747.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/37251899621.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/51049342122.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106b8b02f1e6---2367840037.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/bovidobaxazumilojexute.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab0b7bcfba---12207303715.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/gjfniobagm610afid3gp1fe8fg/94691044116.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/89988764994.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/74526778868.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3a7ae823d724b6b082834f55da5c2de9/48978741064.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611ef576f069a---29089621204.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073db1fd38fb---89848359288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=reduce+pdf+file+size+below+100+kb+videoPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/10e6d609aaf43752b9bbb7bd6d01d627/94361719404.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_off0000cd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD09 18380 bytes
SHA-256: ef570f6ed2b0a5e50da97cb81c2df477188cf2e7b2d44c0f706a9fff61e7c91a
font_01_sfnt_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 10912 bytes
SHA-256: c6273afd49f12630cdab4e81e22e8fd4c9923366a662cfc6f7105459911624be
font_02_sfnt_off00011681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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