Malicious PDF — malware analysis report

Static analysis result for SHA-256 7271f9eb4318dae8…

MALICIOUS

PDF

88.1 KB Created: 2021-09-04 07:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d2dc05c34519779c84d6b6ca474cc21f SHA-1: fb2c97deb8374f2ce21e4bf10570721e9839fd5a SHA-256: 7271f9eb4318dae8464e76ce660438fe78b7504763ebde62eabf8e4c4e8ca2a1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1742e57bfc---toxilowegajowu.pdf In PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/laxawaketuverejevuf.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afe3ae303a8---95013623670.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/6ef5b44019592da2dfdc3c734ef842b6/xuxuvonofezorolug.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/42368833478.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/jegexegusuzasubel.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/85678508703.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/padozerebu.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/98014546629.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/51890212480.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/fetim.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/wubidevu.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/427a27c4bfee8911fbc7437a78b29767/nozuvokinizijoviwu.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/wudabagosekifafod.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/75975146926.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/bimezakubimere.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/mixafidozivamafifovikamap.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4cick94jp5g5avuj4vmsbfdl23/64969305010.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844927d85de---55390834080.pdfIn PDF document text
    • http://eternoohydro.com/d/files/55594705287.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/junixide.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/feboxudupotetefufa.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/49328fa4252dbca1d80ee8123687695f/sefinoguti.pdfIn PDF document text
    • http://2440027.ru/upload/file/pokum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=msc+industrial+chemistry+syllabus+pdfPDF link annotation
    • 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_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 17804 bytes
SHA-256: 6b85ccf01759296ffd6d4a1100186aa3e27cbc320441cba8b415a2e09cdfd2c4
font_01_sfnt_off000120b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B2 11112 bytes
SHA-256: cb484fba5cc9bd5f2d046517ec4363b26845dfe759cf9fe6f1bfa69b44a4fa27
font_02_sfnt_off00013a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1