Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c651327fdb725c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 23:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6d4c0ae8bc204902b7ec3139f5dab327 SHA-1: 282f75fcbbbfcf1e77f0cfa75c89806b41b0c247 SHA-256: 57c651327fdb725cc79ac6a110d0dd6c386a187d9f3c757ff95afa28cff4878f
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to execute a command, likely to download and run a second-stage payload. Several URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/fegijagunuwenirivovanumi.pdf In PDF document text
    • http://probeg2000.ru/files/userfiles/files/tiririmulifa.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/zosiromafalimuralogixi.pdfIn PDF document text
    • http://exim5.hu/_user/file/kijil.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210907105800_so3g67.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/66074029139.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/lilovusajajisibil.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614073581cb7c---19403668113.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/jebadog.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210914_FA15035562895A38.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444ce022f98---kamesebogorineg.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/61387868874.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/ziluxenetavifukepapo.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2a27cae41---mezajevuromipono.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/32999829768.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/45ddd6a40ebb521e6c6d994d86adccc3/gumizadipawaradogozexal.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109140949264791.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/21926126926.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/71961811303.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5a6fae019---41253684044.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/jupovovod.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/bivigufufosagat.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/sakuburirurawonejosoluba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+you+clear+your+search+history+on+androidPDF 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_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 18476 bytes
SHA-256: 872f80074426cf8bcf0f417b49309342b8daefa1d26f492e9a6fa9e28584c39a
font_01_sfnt_off00011286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 10760 bytes
SHA-256: 95d3043f9b6cedf82d6add35162e0bbcd7bea740c612fea686dedaeb8b7efd04
font_02_sfnt_off00012b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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