Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ef1e4485ca7647…

MALICIOUS

PDF

89.2 KB Created: 2021-09-03 10:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 08288a5cc69d778ab5c3e380f67aa021 SHA-1: 0128cb7ec38cf43de8ac386c9ba957bde1f1cbf3 SHA-256: 10ef1e4485ca7647b9ca3a94a9a175c61aab4ab4e44ad244b26da4e920a7ba87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute further malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://smidgel.ru/uplcv?utm_term=inicia%C3%A7%C3%A3o+ao+taoismo+pdf+download PDF link annotation
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/wonijosev.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-24/20210624064639340419.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/gusarel.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d64498feb---zenotikinarodiwukanubav.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083ee6519337---fiwufiki.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3dd3aa5d1aed989b12927e1c1cb56fc3/10640771029.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/gedusafijoda.pdfIn PDF document text
    • https://ski-experience-japan.com/images/blog//file/7553482234.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/zomutukosinegopozego.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/suvorujiwumegetef.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/nfn3mon4r9nnf1duug4k50cqak/kexobefefulapegag.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/74450707381.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be82779af45---72854933444.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dc41702e5e---sibikusezezowobis.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/dfrjj2h8h8cqreo6adgn9fvb56/59933563032.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/9slvbl04menvirpeftjoak61lt/wivibuni.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/37182238244.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610080c2f239a---jupara.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/35536522968.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/danewukidanuge.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f14a10e50---zepavifivisewojitit.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/40030022ed0a43d2afdf46f07aac4e63/jazodenemimagedawejijes.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda5546105f---napekor.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/47249995836.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/wezunovufawegijibud.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d74c9ea99bf---mojozajuxedidawu.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_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 11052 bytes
SHA-256: d9705a7d78756cd074c17375861a0b9d7657d27b40daee4eba98c70437f3fd3b
font_01_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 20928 bytes
SHA-256: a1919db26e25bd4d64958176b209a17a67d85e5242ba8fc224a26b592f2ace8c

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