Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5caf9ea70094c9…

MALICIOUS

PDF

87.1 KB Created: 2021-06-29 15:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb1b8d5e0d3096aadd691847317c77fd SHA-1: d75e6109e41243e38bdc1974be3f41028b679b64 SHA-256: 8a5caf9ea70094c977920a45b008dfbf88755224da33ec085f78883dd32ccf6d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress uploads and disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a64d5552da---76390445492.pdf
    • http://ahkjt.com/upfile/file/45070537436.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c7af3269c3b---badonitokusaxan.pdf
    • http://ctkupavna.ru/upload/file/50634190079.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6367de65fe---66134708314.pdf
    • http://brooklynsmokeshops.com/admin/images/file/55039062935.pdf
    • http://beergolfers.com/blog/images/file/17984024877.pdf
    • http://palenice.net/obrazky_clanky/file/74356792191.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b778f28e660---62870585902.pdf
    • http://aire-limpio.com/img/editor/file/54314489619.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d580c924a0---sunexogurukib.pdf
    • http://colorfulmedia.de/fotki/fotki/file/kaduxufedadevufixawofi.pdf
    • http://volkshilfe-vlbg.at/images/content/files/89623870203.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/1fiqfr6dpd036jv88jbinsgkht/37926735689.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0e6160f71---87309898015.pdf
    • http://ahlhy.com/uploads/file/260326329653.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16080cc0965bfc---59437578512.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/vt3ivgdcu163a4csblmq77hh2j/sizete.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a613cfe48---51312456679.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a733d6c86053b4179f579745f6436942/labapujudiwonoxitumuva.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8cdc33a9ac8806b36ee295a0f3ab0c9a/38009186257.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160d44ee60f813---21047838936.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/b08833e523da416f5702dfce04f0b210/vevenumomukepixudidu.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d383a672b09---jukaw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=citi+field+concert+seating+chart
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f03a.bin
a403ee0d03d56a961c9e3e5ec0257bcb7c0998ad6efadea9a0a9356bac556f4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 17552 bytes
font_01_sfnt_off00011e6f.bin
4b41cc46babcbb55db1f6150505bde1b1f436612af8c499c979b2b56cf3460e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 10784 bytes
font_02_sfnt_off00013705.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13705 16792 bytes