Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb234ff9dd4b11d4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 07:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 04bb90dc503f155231ee4df49fde8172 SHA-1: 28230884e6ed250dff32bf891ed745a67076b17c SHA-256: fb234ff9dd4b11d4d8afd642a29a9529b51e78853a4fb513f66f4e10724375a5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://camile.vn/wp-content/plugins/super-forms/uploads/php/files/gkd66opau34cgubnq684n753o2/1806772000.pdf In PDF document text
    • https://ptogel1.com/contents/files/podogabijanufutorepoxudux.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd32880c2f---fekem.pdfIn PDF document text
    • http://klaaswester.nl/img/file/mojixel.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135df4a42a1f---122547211.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6r15j7t6puoo9plalf63dk3lov/46224033040.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/mukuwavadapudipumub.pdfIn PDF document text
    • http://18554080.com/userfiles/file/luweregowan.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/gojamomimalaxew.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/lizatumidawixezagiran.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/80126751401.pdfIn PDF document text
    • https://citronel.com/userfiles/files/80324312413.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/forisafodofuma.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/91353709741.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fc9d1fad85108976688a97605967a00/juwexagivejuzesimebigomed.pdfIn PDF document text
    • http://lecostationery.com/files/file/somutosipakezi.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/kakitoreloterituradig.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/6391e7865be65bb3617f1e52d278f6bd/10792248063.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/zofamiredad.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/zunelosufimajinifomela.pdfIn PDF document text
    • http://retrofitoman.com/ckfinder/userfiles/files/nafojajamilusiw.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1980cc4918b8e0ba47b6e483b04c6bce/82913316682.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/67820225752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=4k+camera+pro+mod+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_off0000da54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA54 18988 bytes
SHA-256: 76051a41689e6b766f197ccafc7556252afcadd0b06736dc8aa69b924f545050
font_01_sfnt_off00010c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C99 10240 bytes
SHA-256: a7c3234d52ec410a3777a9e35f9e9dedcbfbf3d54a7ffa1cc593f8560c2e407c
font_02_sfnt_off00012396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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