Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae40e2c1da015e9d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-15 20:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f16e72cacfe066e4c5d91708ce2cdb34 SHA-1: 480f08bdb0c4ad71ac139f9735d93e5416952164 SHA-256: ae40e2c1da015e9d3e70e2bd1af0a4a07f1a572e142e54a6fda8c97c1d41d813
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/59924352960.pdf In PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/felifapezidixosubipago.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210901053251.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/39800619193.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/17726428963.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/vanamibatup.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/mowopoxon.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/fezujawe.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136b46539f29---6453248235.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/36993785300.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/wotedanuzafisotaf.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/sikekiwasoguwa.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/bekudofekuwefujiwav.pdfIn PDF document text
    • http://aven.su/userfiles/file/xezikewijivexejopivoxe.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/26782052988.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/dotiti.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/5e73f4f63a5d399002fe7b1bf2ffae01/89599794708.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210907124535_MTAxNTY4NTkzODM=.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/6ff4eda5dd5315566edaa486dbd55539/79251024421.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/vozigawafofumabavola.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/pobinotaji.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/16649199967.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/zoxamasepisodavuviximed.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/35276713702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=kingdom+of+the+wicked+book+pdfPDF 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_off0000dc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC53 10900 bytes
SHA-256: 35e1fb1754a183223983e32688c382af3a6b7b5c81b45c469a93a1259dff70eb
font_01_sfnt_off0000f4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 17804 bytes
SHA-256: cd70f262dce6e1305512f3594f096cf5c333d3140ffcd0fa62d7f44117512210
font_02_sfnt_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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