Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae753cc6f0f516b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 18:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e28d1ab10b755b414babaca933266b46 SHA-1: 0e43b2052af5de8667a62a4b339c5a4c61d55b2f SHA-256: aae753cc6f0f516bac810da403dfddbfd7a3bf9b6c3fdcd59396ea14ff386a3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics identified the document as a link farm hosted on compromised CMS uploads and disposable hosting, with numerous embedded URLs pointing to potentially malicious sites. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=mcent+browser+2021 PDF link annotation
    • http://interroadholland.nl/userfiles/file/44499203622.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/jebuxonufilusomujujagijo.pdfIn PDF document text
    • http://gnox.vn/upload/files/gituzatusavupepiresuruxab.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/tobanajigepuxe.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/muzalu.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/745pkibtiupv2s13o7ja69cpok/wiwigaforo.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/js4140udhk4f1s486t0om22hao/zesavenifujopadovode.pdfIn PDF document text
    • https://led7.ru/file/buzobi.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/buraluzevudepuwen.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7f06289c8---tevoridexigirutux.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/wikatu.pdfIn PDF document text
    • http://kdekdyjak.cz/data/82552805778.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/79816d73030da83d5e6911ba9a0f8daa/47121940527.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/89447646904.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/dibebimivaximebubenoroto.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/98611242372.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57696905810.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/56448891621.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/34610185797.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/39925807852.pdfIn PDF document text
    • http://crm333.com/documentos/file/62827787608.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/68088541217.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/15916847092.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_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 18564 bytes
SHA-256: 350cbf46282ae610160bda66985664068abc99eccaa5b28639e161d1c7e6bcd6
font_01_sfnt_off00010ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BE 10436 bytes
SHA-256: 21c0e19f422de75d6fb4638868e52bed956ec0161beb1fe029396e6cc04a22d5

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