Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc716645c6d0b6c…

MALICIOUS

PDF

83.8 KB Created: 2021-08-22 02:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8ac13bc374a37acbda76f425d2c56b19 SHA-1: a75bff01140c6a22d9f131cd66318d78dc21a87e SHA-256: 5dc716645c6d0b6c232a1f1f345da5024d3a6739ed5501f50ad8331c82172c3c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the 'super-forms' plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to these compromised sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ostc4rrp65gtksmfll354c28u7/jesumozekugokulov.pdf In PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1625612212.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/13473ee6c20fa3956e054c5122f5ae0d/34310950428.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e73eaaf90de4d14aa9fe1f99152f2c27/xugelomidi.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/79318589021.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/46102649302.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/gezipezomufifogarafile.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02789609fe---fadapasiguso.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/03r4vhn4131k51oovorl0fm9ht/lotomerozevelo.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/69223510363.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/71108440738.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e30792e150037fb4974c5feaaf254abc/xojezatazewebeded.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210619185124699.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/xawomafegikusin.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106120134492423.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/9707099608.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/sutajevub.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/dileruwigomazimi.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/1f56cd1db156b8da1c6e27a0bf987d0c/13734980064.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/82704937033.pdfIn PDF document text
    • https://arerp.kr/data/file///kaxoputiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fur+elise+keyboard+notes+pdfPDF 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_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 10912 bytes
SHA-256: 74700b9ebef96ec69832a3691380813154d56aecdb121e6f08a25b5875a3f307
font_01_sfnt_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 18556 bytes
SHA-256: 954725007426e79df3e1cfe3fe9dc18e2b930755fff40eef4a1d6bb5abfb77e8
font_02_sfnt_off000127ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1