Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d6e28d30663f4e…

MALICIOUS

PDF

81.7 KB Created: 2021-06-30 01:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17cd1a90c463970305b0db01dab8b70d SHA-1: 2cf4ef93a319e4e1d55d3dcab8d88d70132ca815 SHA-256: 15d6e28d30663f4e74dee73a721b05e447c86f50a44eee02c3c49707eeb5f235
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for SEO manipulation or to host phishing content. The presence of external URIs and link farm heuristics indicates a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a62150c4d515534250ff60cacf657a7a/79153360859.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/160ca4f1666f02b85e8aeff29c7cbe96/15819579281.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/54d44d3fdfc1064b7f1e1d2824e313bd/wibimatipazavumatet.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/244a9fa9861f6ea89e81c0a10ac77edb/talerid.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/gbjm8titltv8k30de98fnr0hmn/89177651999.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/oqf6qi2l9pp25gjpjm76503qfk/49235007589.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/9afe43977bc7114fb90037d841df4141/26608947090.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d15fc641cd---fesujejewalotenegugu.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/plengtridvra760nbnailpdhu3/bufosibesufokuti.pdf
    • http://zdravi-kromeriz.cz/files/file/52717582182.pdf
    • http://wonsakai.com/uploads/files/rudonikejupokofo.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e06a294f69cdb555f0b57a28f5266985/96503395868.pdf
    • http://mdsalon.ru/img/lib/file/kifufudegibikosisinasu.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/38e1e00dd639d619832b90540433af67/zabadovunisuzisozoxag.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076828abeb5b---lonojimidotutixifezuwani.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/90831537218.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/1046d870dc4ca5ef6042d0442529bd64/nukamikadovopi.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/26268808685.pdf
    • http://bannhuaduong.net/upload/files/dewerefedubidipixogo.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160db8c1becca7---zikoxodibuvatilulafab.pdf
    • http://poorclarescork.ie/images/74083994637.pdf
    • http://akkoryazilim.com/userfiles/file/67053222656.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/97jtii7n1rnf2klk01val91gf0/48756185707.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/bfa7f1cf0a6fbf64fd8aaddcb2e5fa33/lewipave.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=square+roots+and+the+pythagorean+theorem
    • 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_off0000d9b7.bin
abbee060840c6daaa468714b5f8c81e5b2a81b73e41292037aed69487fbdefb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B7 17540 bytes
font_01_sfnt_off00010800.bin
601c3ce8287afb060520ad91a93f0f85d56467b07f33125d93ac5f409ca07c39
pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 11136 bytes
font_02_sfnt_off00012159.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 16792 bytes