Malicious PDF — malware analysis report

Static analysis result for SHA-256 738e5cd112d25257…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 04:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 976e65f0f363fb5bd7a26926c6b21a56 SHA-1: 372d1d2b878c144249cae36dfbb2ef1c3f253471 SHA-256: 738e5cd112d252572773292ec8c80224352cd18e7a8b6aad8a9bef8dc8487586
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://futimisdev.com/userfiles/file/fuxel.pdf In PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/dotinibenusukugojawor.pdfIn PDF document text
    • http://opsir.eu/files/file/veluxumej.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/gvcrpj57jlh8p05i00nhdagra5/51985806730.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/fiwewajaduxezuwawodij.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/67592312886.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/85867610683.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/lesafima.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/bezawopal.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109121812326138.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/lojatatitujeni.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/77639453723.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/zavom.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0272127b---piguxutewoduwotiwurarodo.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/87162121119.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/71806836720.pdfIn PDF document text
    • https://hgb.se/filer/file/nafavepijowefowimu.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/fikonivu.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/38112755337.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/45858cdcf28c17e4b3c5f7b0ecbc7702/99530765259.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/2566211155.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/8520812333.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/44784260591.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/56754637623.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/pixobomedijugivog.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/60058152844.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/26733429735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hay+day+apk+hack+downloadPDF 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_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 16428 bytes
SHA-256: 878a0f87c5c0e40bf1ee78165ffae20ef60e74839f3c98025098091c921f4042
font_01_sfnt_off00010c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7E 10304 bytes
SHA-256: 12ad15360515e32116c58be7fcddba58540cbb17cee7cc8db36ea31d4ea53b09
font_02_sfnt_off0001239e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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