Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fce382e6a8b4d24…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 00:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7aaaeda1a65b7a2da35acc1c1ba5d3f9 SHA-1: 7ba4b393409db792342649ad15003925da6d1937 SHA-256: 1fce382e6a8b4d2415780eea980db09cc34e6db5e89b78b4d187143342481092
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the exploitation of vulnerabilities within the PDF reader to execute malicious code, leading to the download of a secondary payload. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=secret+superstar+full+movie+download+filmywap PDF link annotation
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4fb7ed2ac---fukuxudowawarituwe.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/makavipokawopozaridi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/valamilikolepurujofoxorin.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/96701591810.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161342cb7dff5c---73077951868.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/23677151222.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/50248647081.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161413b9cc7411---3678764213.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/63061919720.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/wovusudepexamalex.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/89230099486.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/somifubisezot.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8a3013658---suzajijof.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/97408060626.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/mutaxemawosozetewukine.pdfIn PDF document text
    • http://abc-tel.ru/data/File/lowido.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/28560948406.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/62464622937.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/susarilojirumud.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/wafuwif.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/vozozitiw.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/12195832802.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/48563209708.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/46145335399.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_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 17776 bytes
SHA-256: b3ac26ab1d5ec6644eb9dda10387435c733687bbb563db36a19040ec444dbef5
font_02_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 11220 bytes
SHA-256: 30e5831f091da1e2f69af86093782626e011ceb33098aae44bcf5318558e3001

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