Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c9af9dbce66e31…

MALICIOUS

PDF

71.1 KB Created: 2021-09-18 04:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c7ec1f0c3ecd9b7559cc7a83219977c SHA-1: 30fe3072905bde3af04cf4d070c0e02a38afca0d SHA-256: e2c9af9dbce66e311d32b964acfa302ba025c950c08bb506957d90d7f2b6db84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the nature of the URLs and the heuristic firings point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://qian-ho.com/upfiles/editor/files/75094308586.pdf In PDF document text
    • https://ajambary.com/userfiles/file/kufarut.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/mudetof.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/41669a1a794f4dd759a07a47a289ac10/nuforogulutumojunokefos.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/27344235279.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/12936350775.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/figip.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/disulirapadolijiju.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c75422f6fe---19327614814.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/53868409569.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/98396856733.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210917_054349.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/nukofufeda.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613921e2f1f5b---30750359292.pdfIn PDF document text
    • http://opsir.eu/files/file/80102546374.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/87279763365.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/90509645241.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3532a70d5---28933483797.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/13757527152.pdfIn PDF document text
    • https://funke.be/data/file/625622470.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379ebf585a7---bataf.pdfIn PDF document text
    • http://marquisdecor.com/userfiles/file/54482963658.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/90218649398.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/kanevotimoniwagazabame.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/geketezoligamakujejeb.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/14206766660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=n64oid+emulator+apkPDF 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_off0000b4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0A 10696 bytes
SHA-256: 5d74e56799905610b6f22d01dc0816bc4c69f29d336481979063a9bc99766b61
font_02_sfnt_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 16100 bytes
SHA-256: e62a041d0e25577a3895e9ed39beca2d17cec387eaf06f7cb12eb40cc48e28bc

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