Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c81112fd0a26135…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 01:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18ada6ddcc1ae91940b132862acec2ed SHA-1: 0039500c2dffe19cfd632828ff515093631c7b4d SHA-256: 2c81112fd0a26135e6604af427a1bb903931a8bd07a3e984a0f8a55e51b52c00
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers strongly indicate malicious intent, with the primary goal appearing to be phishing or malware delivery through these redirect chains. No scripts were extracted, but the structure and URL patterns are highly indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e250862c9---66867954308.pdf
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/fisanadejox.pdf
    • http://learnersdigest.org/userfiles/file/39347960473.pdf
    • https://fenixfalt.com/userfiles/file/selemaxijuk.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3gugkg4lpb3v9cbddbnb14jv22/pabusig.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/7ea2af6181825f9a3a9cc705725eb98f/48677160432.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dedd81e40b---23648408198.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/3774c73f7d001c298ddc7d459dfb94d0/55818846280.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f9a0a268---kagibugidupizupe.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b96ff30f28---fotatuxenogipikaduwodar.pdf
    • http://yuha.be/_files/file/kivepate.pdf
    • http://qlinairnv.be/userfiles/file/46348679048.pdf
    • http://nowyhotelik.pl/userfiles/file/jivajufusedu.pdf
    • http://www.siphonicflowmandiri.com/upload/files/83819464295.pdf
    • http://megalightgroup.lv/uploads/files/12219189823.pdf
    • http://rudolphalexander.com/uploads/files/nitiwomogajenejugosozofaj.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ulg4tuuttb0pihoetjunhagm5u/25752224055.pdf
    • http://snsi.jp/image/news_file/3141505668.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/cgj9mn7ih2f3jm6ti5cjjjij8m/tefafefevigif.pdf
    • https://autosaloncenter.com/uploads/file/38878249707.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/4f44aa4f0eedeb6307490d677bbc5429/88118926956.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df477adc47f---22914425938.pdf
    • http://cnokorea.com/userfiles/file/batenazigevoz.pdf
    • http://euro-ex.net/images/blog/file/ratonuzavo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=archaeology+books+in+tamil+pdf+free+download
    • 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_off0000c900.bin
c1b2e01f82dc9ef869f798cfca521f18008c896f2aebbbe3c415c4341710dafd
pdf-font-stream PDF embedded font (sfnt) at offset 0xC900 18628 bytes
font_01_sfnt_off0000f86e.bin
784950769908f78e2cb4bcb2b42557d70ee0d307d0f115436e4c2947554dbd24
pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 11480 bytes
font_02_sfnt_off00011312.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11312 16792 bytes