Malicious PDF — malware analysis report

Static analysis result for SHA-256 604e5ef0365098f8…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 00:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d5346ff82a97abe1bc721aa2809fadbf SHA-1: eb15dbd66897ab8d71890def2a5ba4cd93dd9791 SHA-256: 604e5ef0365098f89e7bf6b45406da6553b4f6d02347c86a31a56b2775aec2b4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are flagged as link farms on disposable or potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sake2metustin.com/uploads/files/vasajiredus.pdf In PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/mexubanapemev.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/47931820639.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/tovugidikix.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/zapowawepiri.pdfIn PDF document text
    • http://att-na.com/upload/20398080072.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/gaduwemobumubatodowa.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/jezam.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/67341615374.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/rolovulipubo.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/suzifegubofugi.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/42180485020.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/najadimipotolikubazafizev.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161403496af364---95133189679.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/mokirubasuzivovatakelo.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/73377426453.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/79117164529.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/3b70835caaea43a4fe06288f3c605db9/xuwunumixo.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/zugilopafakaroti.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/tazijokojirel.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/38d27a78f4ed592963181fc71155f16c/20036642122.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/57682779937.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/kunafoj.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/ziturojifamobikovub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=samsung+galaxy+grand+prime+4g+software+update+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_off0000d756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD756 11396 bytes
SHA-256: b45fb3b92049d1d49f14b4da43f7998eae27c860366a9370021eabedaaeb757b
font_01_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 16968 bytes
SHA-256: 9a7d19baa88f97f01e1154a8bdfa0857ce00ed7b45f99181c08c19002c207350
font_02_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1