Malicious PDF — malware analysis report

Static analysis result for SHA-256 277778c4c35089b7…

MALICIOUS

PDF

83.2 KB Created: 2021-08-18 20:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c0eac9d6a3812eb99b11661c02435e5 SHA-1: 83fa2363469c54c99d81933bab67c6835acbefff SHA-256: 277778c4c35089b77c1c1f753a1e764ff324e8626d005044645175d2e03e57bb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The heuristic firings confirm the presence of external URIs and link farms on disposable or compromised hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=do+white+candles+burn+faster+than+colored+science+fair+project PDF link annotation
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609586d8f0879---12207097094.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099af4bc98ab---73662054277.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/11107314577.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/tomowibozajut.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/nojiw.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/s80mfjls3bjpijkkj1tgoml7k1/fetiw.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b46cbd6b649---74961284599.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/kemesa.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/7221260811.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/dc6a9d75e41874f9133e33a5d86d6875/zital.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97503006097.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/f7032db4550ce6cad02652898a8ff69e/mujunevuso.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/1a5un19c20o1vlhnnscvp54i8u/ninovapejixojuxodume.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/rujer.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b23fef203---fimakegewabe.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098add4bfd11---kizetevexixifowalij.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/zotevesudekivatile.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/24/file/20210524_160610_185.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3957b6a9e---98389614363.pdfIn PDF document text
    • http://drironcat.com/images/file/90984277613.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e4304e785---41033972396.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/67886274446.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0946e48ca448d280dc263236aa20fcaa/92533206943.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a29b140a4f---68142938903.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/vokefipogeke.pdfIn PDF document text
    • 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_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 16500 bytes
SHA-256: 0509bd2d1ba59836ef00b068fd324d908ba8e8175465ccd7fc285f68ccf20c90
font_01_sfnt_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 11172 bytes
SHA-256: 3f94d7cffaf69d7fc5df557087ae2f670272dba628c5300f96275166beb928fd
font_02_sfnt_off000123f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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