Malicious PDF — malware analysis report

Static analysis result for SHA-256 f369e031178f292a…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 20:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3cbd94c5fb95a6771229008896895363 SHA-1: a4933fba6258edd305c9413a588a4bfd40ee63bf SHA-256: f369e031178f292a86284770e1514140ded348ed4c15635a756fca98d9a405ac
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to lure users to potentially harmful content. The presence of these links aligns with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://insinkerator.us/images/uploaded/file/91216371739.pdf In PDF document text
    • https://pachetedeturism.ro/images/files/41696365105.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/direzudowoziki.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/94219128935.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/romubenet.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/11810685520.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8d473c2e---kabogupamupobojer.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/2594750946.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/3073243775.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/sanegevutosemu.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/rixifodivodujovetoxev.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/97717626313.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6cacb17247087784c9b9239fbb348046/gawugoruvejekebigukot.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/88078636793.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/25129561222.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/5998765634.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/fojubexusomudas.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/zizububatukureledub.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/91059533456.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd6f55a53---96280929749.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/58938887438.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/65363232415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=naveena+thenali+tamil+moviePDF 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_off0000bc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47C 10148 bytes
SHA-256: 1dba48e32a227aa669342f7843254504d1b499663359a65fa976828d519f39d6
font_02_sfnt_off0000eaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 17480 bytes
SHA-256: 61f2cf749ab37fe8592f6af5103ea1885e89aa774604ec3722065148c0ee7657