Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98c504c11d2e467…

MALICIOUS

PDF

103.9 KB Created: 2021-06-25 21:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51374c38b3e029626fbf3b1134e02f85 SHA-1: 422563283ec0c362404497f0e2462c6f7273ffb9 SHA-256: d98c504c11d2e467f471457203d2d5c3228d78b53884a1bd9c068c4f486c0400
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://wastran.ru/uplcv?utm_term=shoot+the+monkey+gizmo+answers PDF link annotation
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8fd1a9e3a---ruzubesuwatepiwixar.pdfIn PDF document text
    • http://aps-mes.com/files/file/lufizadudotif.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/53707537086.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0e4942f85de925db12c94c440344eea/zusafojamidimafedapuvef.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/lezawibegopujirurek.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/o5a3unb392a8dgp55rimh3g2g4/34651330718.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a4ce6813---81390266137.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/03357e3b4a0de93ca8d7e6b36889464d/98065665917.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/aaadaba7d215d3f63b7950a010c056a3/74867593487.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a818f9ceaac3ddc4a9a029b53e7d3698/jodororufiraviginuwes.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/bimifuranugixipisu.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/8e9e2acc755632cf44647af677820dd4/5907699439.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090faf351d8a---fopuwamujisivaguk.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/84884431373.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/mapuwofulewola.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/30117271852.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/foluvow.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073b82f3e7cb---jirasigoxolelu.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/17335070692.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f287e6de940461f2adbcbb2e9fc77231/19768928895.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087057379612---mowegisiboxemudukagofoji.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2837b2c53---69837634082.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/maxerexirutilusujizipozal.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/binevofekuterabepusonu.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/14fol6dmc2qe8gtgf0idqbv62n/bikoxezelitedajepigapato.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_off00013062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13062 18916 bytes
SHA-256: e95500de2f79c58b55a7584d4393e95a2e1ebb0329eda4309c1a437d421c5c1d
font_01_sfnt_off000160b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160B6 10936 bytes
SHA-256: 77001a015d5f61dad55a66fd598417ab2e664ac54d8533651403c56e0dee1e80
font_02_sfnt_off00017a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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