Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65bc23093b0b1d8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 11:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f9757bab623d0ea3621d14b2c070279 SHA-1: d3fa6a387b87ed801d5cc25650b2e569b81eea70 SHA-256: f65bc23093b0b1d883d41a9acbff127817095e8a7ff7130aeccd0f2fcfae6a6b
156 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 domains associated with link farms and potentially compromised CMS uploads. Heuristics indicate a link farm pattern and a high ML score for maliciousness, corroborated by ClamAV detection. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://lecachet.fr/docs/files/sepoligo.pdf In PDF document text
    • http://taiwan-tsai.com/upload/files/fojonuzowitefedo.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/58064130856.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/03dddb3eeb56d75f50e79e5a5e804a7c/xijubavinisekesafugimoxa.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/78599733235.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/21447092248.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/64283296060.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/pidutetetopi.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/sirapo.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/vowixujotisubanad.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/56326198037.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611bf825a8c2f---14046154619.pdfIn PDF document text
    • http://strandedtattoo.com/file/fefiwupoxavebarumado.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/bujukit.pdfIn PDF document text
    • http://terminsk.by/pics/files/disezuviwu.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/ol2jseotjqcvfand0olqmq0q0i/lizarowumokagu.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7245eb3a1cd050028527b03b698a1f15/zanaxalizawaxepovirotan.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083fe71ecfb7---20613754088.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/30654470193.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aca4dbdfb4f---13902951197.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/su86nvnaoh77va1th845dmf9rk/lazunedogavuzojiwa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1370bc41e---45695698338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=levelling+equipment+pdfPDF 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_off0000dcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 17564 bytes
SHA-256: 1ab1566fb2ea179d5460ebadfe1af1217b37fe85e3036a2fd9f702c0dc132520
font_02_sfnt_off00012231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12231 10560 bytes
SHA-256: 8d8830c23c50d653684fc4d06867f33ded5c872aab8bcb2a9ccbf14c2c353b40

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