Malicious PDF — malware analysis report

Static analysis result for SHA-256 c557569184ddf47e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 21:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c996f3de53d6701aa6b4778c184f882c SHA-1: d60cf7f5d0a3d7f9d65b02bee80c2b61215e1626 SHA-256: c557569184ddf47e66db48ff0378919d07eff2e6d3c5f2dc7cd657e76aac1e2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16135a061808d3---72166137905.pdf In PDF document text
    • https://rmduncanrealty.com/userfiles/files/85897478538.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/buxotowepabujorotukez.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210914095204646.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/23100802229.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/5eb77515f68c17ff5c884e43d94e35a4/maluwebefiradok.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/wujijotinaxof.pdfIn PDF document text
    • http://ud2-140.com/files/momevurukimiwoguw.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/36921673755.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/38190348728.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/rolokunurakefuvaditezo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/28037681392.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/zugokafalogererobovodepij.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/94763363011.pdfIn PDF document text
    • https://paradigma.bg/uf/file/38751946089.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/52073198681.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/mareb.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/regikonesonim.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/41618182794.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/35167664314.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/vosixozejatiparomo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b44fc0bad---pevodugezagawidulasapew.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109021707384728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=software+for+samsung+galaxy+s2PDF 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_off0000de0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 11060 bytes
SHA-256: f62753d2762932f3cb9f4c5190202fab6023cebc1ccb4d72d0b42eb42bc4b9b6
font_02_sfnt_off00011013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11013 17624 bytes
SHA-256: e1a325b030b8d8c14bdaa49be2c815d4b097378f25379b14a94a2293c1f93f33

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