Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a8c6be21595e19…

MALICIOUS

PDF

85.0 KB Created: 2021-09-03 08:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e96f63d3aa40c78a8f58b8b37b8e7c74 SHA-1: b55e4561bf5d36a7965ab8fa8aa8fa7aa2b8f6a7 SHA-256: 54a8c6be21595e1996f266e2bb918c895e8ad5493d42dc5f73c8530931a4dc87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/b88357c1f0a7eafd277f0b9748108093/96486562672.pdf In PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee2ed5dfc---lipikevebeliditin.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/28256054911.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb7020b9de---60026848615.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/83317019147.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/4393acb4f67ae5f770050049991740b1/fusowikusilirifom.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/o9q6dbudmtj8n7n0v4p7e7k1a4/27489619519.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/1eaeea154ee53e1b9a98274477d47d74/27289354701.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16121caa350c6b---gokulizofudebugexapes.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/4kus0hc31chfo47da8t1gkv224/99837246713.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/xagopivikovitibid.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/rhpagh0tg033oarm0d7vu53lf9/10225115312.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/madosowulagefupomizawi.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/9adnrrois7h75ueg1hgqknt28r/navik.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/xidokenezidojotakokibimig.pdfIn PDF document text
    • http://dienmaybaongoc.com/ckfinder/userfiles/files/lajul.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/24282829777.pdfIn PDF document text
    • http://llux.vn/uploads/files/81645657489.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/238hi6b8724i9fh2mge9ntumt1/ranewonolabuforage.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/jogetatajebob.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/1918215816.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/16853609090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=solving+systems+of+equations+using+the+addition%2Felimination+method+worksheet+answersPDF 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_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 17640 bytes
SHA-256: 2b08aa7f25cc478234342b8f32b3df93967dd79ec6e6b87aee1cec53d82dc24a
font_01_sfnt_off000112db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DB 11516 bytes
SHA-256: 0241f0f4e184e3f0134144a5dca33f075c65fc95b7a64d92f3a0fc194f92a0ac
font_02_sfnt_off00012d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1