Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b3c7117509aea0…

MALICIOUS

PDF

101.0 KB Created: 2021-07-18 02:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b90122b9f757b6ceafbb495020a64423 SHA-1: 2a8136f488dfd4eae32a8cc12bb268346a0e7f51 SHA-256: 74b3c7117509aea0423a65a972c75cdd44898d87beccad49d077e3dd2822538e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple URLs hosted on compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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 http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36a522b03---9057471121.pdf In PDF document text
    • https://bisnismedsos.com/userfiles/file/rexujofumovewivunizenakut.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/45de0766c43521329340e221f6e57fd5/zirikudunuwajapimabog.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/47488093013.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/demizuvegudeluzozo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077aff9c5a87---23481159703.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/60824499003.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/jipefafavepidos.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16071880a5e7ce---kewaxebizebato.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/56497952801.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/7b00e5e8f601874adde34be85954e613/57606675647.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/sotolimumuweka.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/lipupegurokedu.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/80408fae9c983b51e4bb6af042c9ca98/26016205379.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/66427012521.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a04d86bd9cbcbb13405049b896529d20/jesemebululazepu.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/k6ako7s48fr5956aseti8v52vv/kumubugux.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/5c58qng4mca4m5mlu47ikcl0vu/kilapemopawolakireviwuwu.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/jikuzoribuvanivugom.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mg5so8lpv4hq8d77aupo3hdiae/35038914051.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/3921886813.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/1f56e81715049340578c6ccd70a13590/26899452101.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608076576e2de---janasirufirelimoreses.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/wipemilekoginuv.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/nazojumul.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e941e20e7a---35588769477.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/a39ec7f87627b03157c659f5cddd18f4/87080322489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=groundnut+oil+production+process+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_off0001290e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14120 17132 bytes
SHA-256: 2417edf014b8cfe0b917c5c9b4a1de2be6a636729cf97d2e8ebe426bda83c3a8
font_02_sfnt_off00016df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF2 10592 bytes
SHA-256: 78d898f0f7f0af753c351e8ef544a29bc5dae01923c38836077b0ebcbe3178d9