Malicious PDF — malware analysis report

Static analysis result for SHA-256 b347dee15614e60d…

MALICIOUS

PDF

86.8 KB Created: 2021-08-01 03:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7769377aade8825ac2753ec1e818411b SHA-1: 1a8f55ebb393ae77e9c2ce8767c63e73ec76b383 SHA-256: b347dee15614e60d111b33aab30f8eceb86c226554b02ded19a5ff307911d41e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains a phishing or trojan payload. The heuristics suggest it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites, potentially for further malware delivery. The presence of embedded URLs and the 'invoice lure' heuristic further support a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nomylo.ru/uplcv?utm_term=what+is+preliminary+literature+review+in+research+proposal PDF link annotation
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b664470d2d8---bixufevojubojufagubogi.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/74528435324.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/724ab62a9758f9433cb34630b648839c/52521826535.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079882d04bc8---6480357757.pdfIn PDF document text
    • http://15889163.com/ckupload/files/ruxugibisilekitab.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9fd7dd963e561444a1edc5266bbf9e45/46606936005.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210602165229.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/g4q6ad57gjt3nvj0sq0n8ncvn4/69896484768.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c4bf2e896---31139777846.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/goworajosetu.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/22588151584.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/70932614172.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776cce3ac82---witozefivupo.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/09744af05eff90da842b1d00e76d17b8/pafewetezoxusuguzeko.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/0ef05cb0c5bc6e6a52c87e430cf93198/wefef.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc84c30983---zidikuxemo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d60b89c7a---84250864812.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/zumavisexugepemalopibedu.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/106f3eaee7abc1646d3282cf03886262/satebazajufawamasinobaj.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac83de4f502---noxoxofotuxutadoropis.pdfIn PDF document text
    • https://yuss.it/file/nujemuvagiwapoga.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/j4ksc9hbeo0dn41rbg02idh472/26118401016.pdfIn PDF document text
    • 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_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 17784 bytes
SHA-256: d487e8c4583dc0081bd180205ece12d36f8217a1b931b5f04bf77529651eaeba
font_01_sfnt_off00011bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E5 11000 bytes
SHA-256: 62857bde9b2def434f5e6c207ff4c612c9a52ddf43c42d2134e2d3ea79e4325a

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