Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe0c142603bda61…

MALICIOUS

PDF

99.3 KB Created: 2021-07-29 16:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db7f336008523c667bd44c9a51c45480 SHA-1: 4adb0c4e278494e4fa7df2224b9ec732b4cb38bf SHA-256: 6fe0c142603bda61454bc4e64ac44ec09d5c1ead6e102f6aad4f509219458c8a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests it's designed to redirect users to potentially harmful content, possibly for SEO spam or to host further malicious payloads. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9650

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 https://crewmak.ru/uplcv?utm_term=xforce+keygen+autocad+civil+3d+2020+64+bit+free+download
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bsmptmdfkvip063dotalf1ou0l/durubepelenasogujilije.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/16546043559.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aef1caf77b---rutalegalakizedafepowo.pdf
    • http://sumbulefendiegitimvakfi.com/resimler/files/nuriwojidalobetusofave.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094b4604eefb---guxavexazaba.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/7qn899k1e5v45t1cfaqje5m5sc/binirugudew.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/h217ogurcllch0gjtf1nustmg1/pozonixigivizirerikeg.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ung6uto0upj9vie4mbprokse7u/zuxifasu.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/41546253533.pdf
    • http://eltonltd.ru/sites/default/files/uploads/67809177901.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a786f74399e---zuvop.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/fe63eacee23e981e3f8f22cd595f21aa/sometuzolokikomok.pdf
    • https://sjalikave.hu/pictures/file/kuwogusozikuxafobozuz.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073d958a5794---6188061081.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077739aec6c8---titifi.pdf
    • http://gibisch.org/files/files/vejijaraw.pdf
    • http://aedelsur.com/contenido/files/jazibapazamisowufub.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d972672751119db7938dc8b82321c5c3/29312094555.pdf
    • http://decaiyun.com/upload/file/210628024255433430xthp66vbjbff.pdf
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35997660655.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/d0b2f335065201c293c2311f18665112/28673163450.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/953a4e9e77a72c6fb65b0f46ea6fff24/92246394538.pdf
    • https://burgas-remonti.com/userfiles/file/9183690120.pdf
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/nadilisur.pdf
    • https://apronorte.org.br/ckfinder/userfiles/files/58085452988.pdf
    • http://kaies.cn/upfiles/210602101835348229lgog4y.pdf
    • https://traffictkt.com/viking1/uploads/files/41313132041.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 16792 bytes
font_01_sfnt_off00011b04.bin
cb385d3883d65294b78369455d7df5b6b174a981391fb0b799cc4bb0ff877048
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B04 11748 bytes
font_02_sfnt_off00013723.bin
9000b8283dea93852639760371815540f581e0fc8963607696256d0c186a874b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13723 18196 bytes
font_03_sfnt_off0001673a.bin
76504ab5b6cbabeee32e3f3a333f58dc75f1ffb9c79cf4e060e7f6f93e966453
pdf-font-stream PDF embedded font (sfnt) at offset 0x1673A 16184 bytes