Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf497085300be35…

MALICIOUS

PDF

98.2 KB Created: 2021-08-04 01:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee462d2ecae75096823bd1a50b24f8dc SHA-1: ae354cea05fbbd131c0ac4b0b45c6111439565dd SHA-256: fbf497085300be35b29dea1792cf27f7922a3ea73dee508f0aa84bc24e63b19e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain readable content, but the embedded URLs and heuristic firings strongly suggest it acts as a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://synerhu.ru/uplcv?utm_term=kubernetes+tutorial+espa%C3%B1ol+pdf PDF link annotation
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6faf8414e6---50748214474.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/52475933725.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/nozanoxesizeb.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/55698354397.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/sips2a73m7kjtt203fopf3krob/zufoserugesivisu.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ae32792cd4ce84b58796b6664ed51c39/nofaxejirugugufowu.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210731_B302765767022249.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e143a97f5e---67056587595.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/59506672414.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/kejerupulesuderesuvuv.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/jajimemijefalasumeko.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/pgre7fhpicgv2389upjtv7g4dc/durevomuxesur.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/junizivosowavoxelijunuga.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/246ef4ce928f756945f47a741f8dfc2d/46408986537.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/dirakigozovopugimi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff269d3684---kumorusekomekinemewari.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1a9a79e7e---malarexegerokiwaxepoxav.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/xalezalisegexixu.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/3211801749.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160770127b4a21---vobivise.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/zutedakizukiderejukixepu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/875e7a08860ff2ef72be8dcc4be32b8f/52602189973.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/23484425387.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c10dd2961da4440e3b150bf1b74de58e/77021177034.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2256266ad0---33954567481.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/9b9b2ff888a0b84c08c87d5d5b99f32b/57719385609.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_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F5 10928 bytes
SHA-256: d5b991632bc2ef495018e7dfd92462a5ec6721f399fe767716f1caf231ce5c1a
font_02_sfnt_off00013ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE4 26796 bytes
SHA-256: bd753819fdbff0a404138bc5644669cbe6532d4dfe97360308d7cd8d3c0de91b

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