Malicious PDF — malware analysis report

Static analysis result for SHA-256 9791aaf93a4aacb4…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 22:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 527c933e90c06cb6ba12510332d049c7 SHA-1: c1ad9d645d65715db310c019c5c2232b76767766 SHA-256: 9791aaf93a4aacb45f393462677755baf81ea4fa93373c5538b2dfcdd81e8c6b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The presence of numerous links to potentially compromised websites and the 'Password-protected archive handoff' heuristic strongly suggest the document is designed to trick the user into downloading a password-protected archive. While no scripts were directly extracted, the PDF structure and link farm indicate it's part of a malicious distribution chain, likely involving spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://murten-hotel.ch/userfiles/files/10907553814.pdf In PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13c2de0d31---73806956456.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210811_0828063137CA84D4.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/2582e29870b790f4cd42d47315c85bbc/87713535482.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/21409663172.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0gb0bs9remsv683l83p65a1aj3/47664920925.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/k2cvq03m28u16ki7g6sps6ids2/selefalogasuneva.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/k3ohie40cg4nmdtib8scs0ik99/jefebozozus.pdfIn PDF document text
    • http://fnathservices.com/upload/file/91160357488.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/vepukigaxigu.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/53099136211.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19069f4b3---1060736642.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021522628525707.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/44850104489.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076cee5c02ac---95170812840.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/je5hf6cuo688gug7fuios9t1sb/supuwijufuzupokotiju.pdfIn PDF document text
    • http://mfcpavpos.ru/file/70055568385.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/xakop.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/jepesidufonupavolitameti.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/a195dcb2b15d839ed32830e8bff41b89/noriwesawunorisofoteko.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/38799013368.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/1911274882996141319d92b093b2d9d1/71196148819.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/fuposolofaliwijaperemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=traduction+fichier+pdf+anglais+en+francais+en+ligne+gratuitPDF 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_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 10960 bytes
SHA-256: fd0be5d437e1ad1a56e8e1d18dbc85bfaf0b97d7b65c9ad60ac4af722ba4cdcf
font_01_sfnt_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 20048 bytes
SHA-256: 0b423c07c7b4934e737eb1d702da18f3105010dd2581000a929b8bac05ecf5dd
font_02_sfnt_off000121cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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