Malicious PDF — malware analysis report

Static analysis result for SHA-256 440aaffe9790cd79…

MALICIOUS

PDF

87.1 KB Created: 2021-09-01 19:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 843ba0974293ffdca54e63cf487cddfb SHA-1: 6e020b1cd8bfbbafbd6a709a6ad7cdf2f7890b03 SHA-256: 440aaffe9790cd796a1a7e229abd090ee3898714467b8899c9e0e5dfc44380cd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to directly host malicious content but rather serve as lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/5af96aca154c764cbdd010cc249b7f33/21899571182.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3f2c90c6cee3e0341e487d0d8aa8b063/26028422362.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba7f963f16---fupixejapanasewob.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160799585b39fd---16615539689.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/bapinenazel.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/52952427864.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19fbecaa9a9fc6f80a508afe8554d705/71225083131.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/lasubinupifeja.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210709_981BA3732079518B.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/0dae40d0e3a96eb10388e6f889db6ed2/62275257049.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/4939172952.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/86602155381.pdfIn PDF document text
    • https://edarky.net/data/file/xuvolijul.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/57251364445.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/6b0feff71c139532711fa2b9d4cd4db2/gafelapiluwukaxe.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/masupasat.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/tonuwabutabisoketare.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/39530186560.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e28b7b84e---roxesajusajunileme.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/26373035242.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/xakumepiserinakariz.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/kegaditixuj.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/37318746082.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/20364055611.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/27968149380.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/65906933577.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/dbd99f5f606270e707c6a5ef561471f2/romajapasafuxir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+nuketown+zombies+on+black+ops+3PDF 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_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 18080 bytes
SHA-256: b4a01ea0c97678a49a16a6aa006bae5061e5cf5047273637f6d23e9f5d803155
font_02_sfnt_off000133c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C0 11256 bytes
SHA-256: a2d97c0a0a53606b5a21ca08d927a5af99a699dde19cbcb26408cb132e3fb632

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