Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d818bd52df798e…

MALICIOUS

PDF

87.1 KB Created: 2021-06-17 06:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0b7ba7708561a6d36ac5c4f8e0f242c3 SHA-1: 5230c060f5bb2bfe7971bb646f2de184e2938302 SHA-256: 54d818bd52df798ed64e08c7d2dc252a825e1b2bf1bef7ab4db6621f431fecd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://archism.ru/uplcv?utm_term=download+ti+ft+young+thug+about+the+money+mp3 PDF link annotation
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/k11fkd2bm1ao8hd58gg7le3iv9/97915702298.pdfIn PDF document text
    • http://toonesk.com/upload/51575226605.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2447e5e988---43440402173.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/59872071520.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/38060011040.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/93228779005.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/06f52e6109d65d479ebd1d98f7f92b2c/lebufefezutulan.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/72925656267.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qnbeu7gq4mfnpuqs1nt7n7io00/purizegoruzel.pdfIn PDF document text
    • http://imaginove.eu/data/Files/vuwupolazukuxenasade.pdfIn PDF document text
    • http://axwelindia.com/uploads/90886341602.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/73781778864.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210609_CF738809EC3B9F49.pdfIn PDF document text
    • https://mfdesign.hu/files/file/14011619766.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/mawagafepukizapodisoluju.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607109f2563bf---japerurol.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/78804552781.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 5680 bytes
SHA-256: fdfbc71278fdab8f3bb62af40a98fff10fefaf0725fefb166627871d7873f191
font_01_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 2140 bytes
SHA-256: a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b
font_02_sfnt_off00010f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F23 13196 bytes
SHA-256: 53a1c04b88e7934b670dec4883bba74edbc00d2a4a4fb66b4044cd92d8eca628
font_03_sfnt_off00013934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13934 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf