Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b32ce3b724a326c…

MALICIOUS

PDF

86.8 KB Created: 2021-08-04 19:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d84e089f6945bc3564f7061fc8741a8 SHA-1: d41f59e3a31452038cec0eba9751f7c289da2ada SHA-256: 0b32ce3b724a326c5f26dd307f0ac05993365f2fc07c6855250a2ec91589a155
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various compromised websites, likely to download a password-protected archive. The presence of multiple external URIs and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggest a social engineering tactic to trick users into downloading a malicious payload disguised as a legitimate file, with the password provided separately to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=epson+l210+ink+pad+reset+utility+free+download PDF link annotation
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b127da317f2---zopuradopiwevixija.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f10118e3491---72672042039.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf46a595d---vinazasakopalare.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/71d732c8845cbb50599058c382341f02/zeludabireb.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/zegatozokelezumul.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/gubufijuviboxexumikika.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e00419f55---30929072196.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/97591066132.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/rezimifegafa.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/7543c3bdd89056755ff0aabd908277d2/kalalegetawefeloza.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/41123585491.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7761584b5c12159eec42353500c664ae/nuxekexalekax.pdfIn PDF document text
    • https://jambukuning.com/contents//files/87026739826.pdfIn PDF document text
    • http://elm3rad.com/file/fuwawuridajiwol.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/94993892679.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/149603787360e03351b4296.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160985a990090a---10142100093.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/rahbcdhdm1b5rju16uer17lc03/15727141054.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/35913456514.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3634c844a4---41921045526.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/49756598872.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e9e31aa30---juxazukalawusib.pdfIn PDF document text
    • http://ramsteinroyals.com/clients/e/e6/e68fa2bc61b75b8a06766e25905052c7/File/gosemezivajatizugob.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210706_3199D41BAD4CEDC6.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_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 17992 bytes
SHA-256: cc58875aa0ac0212c75f6aaee66c8eb6d9e728b25b1487a4ac06d0d56698c4d4
font_01_sfnt_off00011a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13270 11160 bytes
SHA-256: 8a6534a129d19884ed6f846866b045100b52c9011a0739660e6a83a9bf402dbb

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