Malicious PDF — malware analysis report

Static analysis result for SHA-256 417da777e2879a74…

MALICIOUS

PDF

101.6 KB Created: 2021-09-17 18:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4fa272c7e0acd6f3022b515614794146 SHA-1: 2e30c463b37c82170289fead64fe66280e8fde8c SHA-256: 417da777e2879a7486673a741fc71a258dc67e54444885ae459217e5814ebee5
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload storage. The ML classifier also flagged this PDF as malicious. The embedded content appears to be obfuscated and does not contain directly executable scripts, suggesting the primary malicious function is to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

Heuristics 5

  • 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://reginahajo.hu/_user/file/piwajasifojobiduteg.pdf In PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ea1eea521---duzolakolepotiboluguka.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/74695100716.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/89157762057.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/kiwatafazuxibadov.pdfIn PDF document text
    • https://dacola.com/upload/files/vopis.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/15352503016.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///gimubemidanugazilu.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/54700161268.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/jukugiwupovekaramenimi.pdfIn PDF document text
    • http://deltools.com/userfiles/file/99063733894.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/jesogukov.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131abdfb9ace---21456538447.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/vodojefobasopexufagebiza.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/kakudugirupate.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/56745162668.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/95027393355.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/10737061408.pdfIn PDF document text
    • http://okun.su/upload/file/fanofire.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebf002b265---119596801.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/64117793841.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/15416874600.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/84365411394.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/mezusolovasaru.pdfIn PDF document text
    • http://kesifveotesi.com/files/13276618280.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/96611671034.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/tinat.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/ritodepexatirifivigodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=kora+online+apkPDF 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_off0001274c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F63 10064 bytes
SHA-256: e631909369e10e1892cd16dee28ff028fe2a3dfca52dfa310d72195a5fb49e87
font_02_sfnt_off000155c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155C5 19316 bytes
SHA-256: 70d936e1839261564f49ecbd314ba261e58c5794368c25e41a01bf9f3e99c77e

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