Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2550f050b6c1301…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 17:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4f4e1899b0c89779bdead6c21da14955 SHA-1: d598c919d9372f9f855a94eb2a434ded8e58f78b SHA-256: d2550f050b6c13016a53fef4e6f50ed3d0411c8710c4f76525ce5be372140666
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.injamal.es/nueva/ckfinder/userfiles/files/87359172724.pdf In PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/pelutofaxobifebetejalon.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/pagegeju.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/41563034548.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/90801758198.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/13434483161.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/61910805261.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/wugur.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/pojezipazimesevurovox.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/3259152578.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ce5b266p0cbb9dhfqiv3p3ue53/luxejufaxuvuditadinaz.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/21761618558.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613023f23b6f7---79609860457.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161338412e99a4---gonopabe.pdfIn PDF document text
    • http://aromata.ru/upload/files/rulenamogomadez.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210904_465197C517F1C0CC.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/jemawotu.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/zodidigupozidejolebep.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/faxapif.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/refilagij.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/74719808645.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/9811986847.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/zeviboripuwigadazez.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/vafebiwig.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/vuten.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+apn+settingsPDF 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_off0000d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 10504 bytes
SHA-256: 0f1b2cc4ac694081daaec93cb0fcc81515904882e8910892f79cdb42c4dad585
font_01_sfnt_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 17124 bytes
SHA-256: 43ba69cf170cbc76ee20863606e7ca8264dd2eace1615425e16cd389265525e3
font_02_sfnt_off00011bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1