Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa580ef04cb4510…

MALICIOUS

PDF

84.4 KB Created: 2021-08-29 01:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 10df251a34ff3b5d491b98fca9d5d00f SHA-1: 57b98526788141f8f3ebcbc40f097e248dfa0e76 SHA-256: 8aa580ef04cb4510fdd7ee28fd26d6381b44620023be0c3b5465dee37934519d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The file's purpose appears to be redirecting users to these external sites, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://oniceh.ru/uplcv?utm_term=how+to+remove+all+comments+in+word PDF link annotation
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/62418484926.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/51b1b4937bb58ec8bb75ebbd7a107334/85162476851.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/62586613753.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92a9755d19---viwugaled.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/betatexu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4791525be3---64913042553.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/akiku57pd4nohsvhhr00c4ho56/66408151881.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/wazitiwurusafo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cebc5795fac---27271918703.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/7f911e341a9dd2a97dd2b48a6d2296ae/24234715659.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090803931ee8---77744518905.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/vafoneriserezunozon.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/566db06aebf96b850e9b5ec995e42834/sijusasidujuzaluzojofexo.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089f3c992b9e---80863934141.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d93f5ed2b6---44890356267.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/kisixarumepomub.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/depaxotusopoteta.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/lijuwozulifujufoz.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/bebor.pdfIn PDF document text
    • http://ing-ka.com/user_img/file/zijugewurada.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5cc17e559---63392942730.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f3ae1f9b8---77929056527.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/navibudegavi.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/55c7e06ef933aff765fa52611528ef6f/kabezenobojatizasog.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0a3925c24d3c6afdd5ede539ec10eff7/14639774062.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/pujajamokabepaki.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_off0000e53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53E 17852 bytes
SHA-256: e40321da205875fca077c32df8bdbfd2a29475e5e1b7273288f23b008de21bb3
font_01_sfnt_off0001132a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132A 10672 bytes
SHA-256: ef40b372a676c4953413836475a07bea8a93e6b6a50fc4813c47ddbd353c8f8f
font_02_sfnt_off00012ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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