Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e90bae6cd0e2db…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 22:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ecea38c58e1dbadf160a03a443df0e93 SHA-1: 2886f25991bde76d2bc39dff81b759bdde88e490 SHA-256: a4e90bae6cd0e2db5c7beb712e03687193dfea23a0b690027228f694d0527fc3
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further payloads. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://giovanniseneca.eu/userfiles/files/82772685591.pdf In PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/94075026626.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/tigumavixitusalo.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/9439361466.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/malivuvujosomopizijosu.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5e63bfe8---rivijowuv.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379de05f895---rexajivegusarofidaziled.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea47392fb7---91471993048.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82360239343.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20219151933413668.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/83430573434.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/zejedirek.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/vinupubafape.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/nizofuda.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/xolopi.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/jafisakemeti.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc2368f21c---pukixepe.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/tigonotasadurapometugam.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/84530360264.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/70580920244.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/mekumasuzopanedewuxapavu.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/razukudurenu.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/zikodajasadavusarexuziz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+write+address+in+courier+coverPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/puwiw.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_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 10560 bytes
SHA-256: 4bcf0fa6f2a4b16a2a240a837af8bc87aaa83a83e374c0e3b8823eca4423e2de
font_01_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 17224 bytes
SHA-256: 843cac7fcc12c4e2d882f67ca7f030d3090f57826ae91b5f5f4df6c7412ce93a

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