Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8424051720f59e3…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 05:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d7f54e90e406975c5cd9dd1dbeac9a9 SHA-1: c8137ae5d4375b4970b4314db42c3eb53166ba85 SHA-256: c8424051720f59e38efa352560caa87c7c98e9a6b7dac0c21cb46809821a4d92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to potentially compromised WordPress sites or disposable hosting, likely intended to redirect users to phishing pages or download further malware. The presence of external URIs and link farm characteristics strongly suggests a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=sql+datediff+between+two+dates
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607581f85769e---mixijoxe.pdf
    • http://showplus.ae/userfiles/files/bobefebapuwoxidapuworofet.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607630f4dcfc6---vapekabazetosegikipoku.pdf
    • http://rencontres-icare.org/userfiles/file/78212351768.pdf
    • http://gphs84.com/clients/866382/File/zegurimim.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160948ddbb87ae---lekewowogaputilil.pdf
    • http://humanitool.ru/userfiles/file/pijipamajepasugozajut.pdf
    • https://hizlipin.com/calisma2/files/uploads/zesumiwesebixo.pdf
    • https://bacninhonline.com/webroot/img/files/susodometo.pdf
    • http://duancanhotot.com/upload/files/60360018693.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/6bb2bc89c5f121f116776fa9ec29246b/tunaburafasazadekexiwok.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cfa26af0b---43806037773.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/p4rvuctonrh4al8vb90lmvpao7/bimaravodezibomuxuvewofi.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608fae6435913---6848142697.pdf
    • https://isosklo.cz/uploads/70522762430.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6d107953b---12939923753.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c677d466a---25307615905.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/v3tlvno4s3umvpkm76u7376nka/pezomederixofi.pdf
    • http://roxburyhs1987.com/clients/63080/File/zunitakufo.pdf
    • http://sugarfree-gelato.com/upload/file/dafijufadizulesijoxod.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/5e6581bfeda1fbcffffff8a9b20f8662/febiwezesaxupinuximepirob.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081088f0d8e2---voxufaguviweribelanavoziw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ff.bin
95b0a3d0a170c7a54fdb4efc24376a0b41bccebf2ddc7c0b551408ea1243e510
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 10696 bytes
font_01_sfnt_off00010180.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10180 16792 bytes
font_02_sfnt_off00011992.bin
45762d9b22531a7e7d5c8a49c2b311b7832b015a8bb3e246273438245f85f4c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11992 18052 bytes