Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c5157f6a3031b5…

MALICIOUS

PDF

83.1 KB Created: 2021-08-15 08:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f09d3f08d8e39da8d34afd33ed959144 SHA-1: 1fc4aa2da210cde13ccd75fa16e1d31203fdd1fb SHA-256: d3c5157f6a3031b5e17b8109a1e0cdadb2edb947d84f60a5d7457da7085c5d5a
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to direct users to external content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for malicious purposes, likely SEO manipulation or hosting further malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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://gesundheit-im-blog.de/userfiles/file/54780784947.pdf In PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41152d0218---guzipu.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/zozidabu.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/92v33gfg610qlsa0j724bm3qoj/gomawiwoxebutebuwudon.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/41216357421.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607716575b307---zaporofugatufamitisev.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/piwuwuxatab.pdfIn PDF document text
    • https://blogsma.com/files/51518034447.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d074357f---zegagepewuse.pdfIn PDF document text
    • http://elitvorota.ru/f/file/49883663418.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69087375838.pdfIn PDF document text
    • https://angkagenap.com/contents//files/runisaliritanavewiberoj.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b220cfa10---33105429909.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/2e5a31d7d401a60c399285ab35a133ec/pazarutirusik.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ef6c26a5eda468f73159afcef0cc2ff5/nokijivubi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e821f9797b---894238953.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/bq5afbkk554fkkjdguc3lrc5ql/jorezipitapakozivosu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b059e9a5335---57692723687.pdfIn PDF document text
    • https://conrays.ru/f/data/80554508877.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/tuwaxuluvozorarub.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/e6444c0957acd6b090ae5499e593716c/70289106581.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e037apma5d5v6kth1lvtr9mrja/nirun.pdfIn PDF document text
    • http://dalaichau.com/files/vetazekewefepikeluwuxalol.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/wolopizopit.pdfIn PDF document text
    • https://www.oapublishinglondon.com/ckfinder/userfiles/files/42327633230.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/laveg.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836958edd48---bitopozawisamekodisiwet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=are+electric+trucks+comingPDF 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_off0000e294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 10584 bytes
SHA-256: 1468362ebad5a839354fd993dde68725426a5348b3726b9f3e12ba465d673193
font_01_sfnt_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 16908 bytes
SHA-256: 00e4d6beb097fd8fb3903148c2b9a12e254c2a3240378fb9421e192b5361e2f1
font_02_sfnt_off000126f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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