Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f9703696631a17…

MALICIOUS

PDF

87.2 KB Created: 2021-08-01 11:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82163d561971f5e0568e7a698de10050 SHA-1: a968e822b8b2feb68a5c001632fc9e67b7e4e531 SHA-256: c9f9703696631a175b290f3e6a8d6c6a1c32fa77f3c89d1cb1ec9c137705aefa
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, likely to redirect users to malicious content or phishing pages. The presence of external URIs and a link farm structure strongly suggests an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe93f8ce2f---93489997118.pdf In PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/20733811019.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0c70f2dc2ed0409eaa80b2d45823134b/bopojuxomomuk.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/2f84678kvmv240fj651s65i4b0/kitesanadoremen.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a18d41c121f---zuwuzonov.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/12348b28bdca03f3526a58789133946b/77453820790.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/50547446559.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e5ccf02a6---9462569901.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/nigenuxogomonamazereneb.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/datakulidegokinad.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/54378120473.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073d9a6b81b6---54051869667.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0d6b9cb440856670d4ebb97ea0a10447/defelegeva.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a88a289606---28240965675.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3808835ee1---6784964340.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854a208c4b9---welijafoxuluvol.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2d0a65e3b---78912352805.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/30aqquiltfktvr03cno8umuf2n/91352358949.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d67c482fdb24ba684fc5c81a76d02000/zosadukomewulona.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/forafogazovime.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c2477b59b13---33262508587.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ob58ka3j16tbuirvppbte7iosg/jefewupiserizevawadixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=servidores+http+injector+movistar+colombiaPDF 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_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10297 11192 bytes
SHA-256: bf04d2d8bfcbdb8a7b68daa6e5a93c8167cee2940612d890ddd3b81b7a063bcd
font_02_sfnt_off00011c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C50 18764 bytes
SHA-256: d98e3a65a2de2dee5fcfdefaf69208867c333e9a7696a27be7924c90f5f7a1af

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