Malicious PDF — malware analysis report

Static analysis result for SHA-256 808a883bad626953…

MALICIOUS

PDF

72.9 KB Created: 2021-06-18 14:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9188b953966d8bd660473b0b10e2789 SHA-1: cd0a0c3793f39c7cfdc1012b2f999fd1198aafaa SHA-256: 808a883bad626953702db1f751e291bae0cc46302a8d8fc51ed2cbd3c9a1229e
164 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains an exploit. The presence of multiple links pointing to potentially compromised websites, including WordPress uploads and link farms, suggests a phishing or credential harvesting attempt. The document body, though heavily obfuscated, contains references to download prompts, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dailyliving.nl/ckfinder/userfiles/files/61218533237.pdf
    • http://abc-tel.ru/data/File/54027533676.pdf
    • http://schs1968.com/clients/861610/File/77067685118.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b64f449cf2---36836400755.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160730de7232c6---14900981988.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/fojemav.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/e1d21jjmfqj58mj8irct9oolh4/jodidasafo.pdf
    • http://sushiloverca.com/uploads/files/meniwoz.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a13a3e5d48---28675599608.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609480083c25e---38346376317.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081eeb1330aa---nixedikis.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/9hq5a0on79od4trom2kukhvusq/43958895944.pdf
    • http://cafemsoffice.com/userfiles/files/76332293088.pdf
    • https://hinodanang.com/uploads/image/files/84952612366.pdf
    • http://wittlich-luexem.de/userfiles/file/62703585147.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=using+commas+with+coordinating+conjunctions+worksheet+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc14.bin
9487a135d0ef805bdf833ce807c290511a101521a31fb915e77fe36d9af055f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 5544 bytes
font_01_sfnt_off0000eed9.bin
93893aa9a70774c62cee6d33436e962f9a142c964bca5973b60f469662ad63ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 10968 bytes

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