Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb1acc38bdb7297…

MALICIOUS

PDF

84.1 KB Created: 2021-08-31 23:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a126bda0e740f8d49f03987d9b2f225 SHA-1: 3abf34d66b7b87aa0cf2b72f969ae97a56c57126 SHA-256: ffb1acc38bdb7297bae7dcbec8d937b2b930fcb99bd0781c02bcee8d2f4c9397
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, forming a link farm. These links likely serve to obscure the ultimate destination and evade detection, redirecting users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://kompaspt1.com/contents//files/91334749269.pdf In PDF document text
    • http://thermcom.cz/userfiles/file/xafomulobugenuroki.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/zakodaresukukole.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608178ca31c70---rogifagoroburisofezu.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/xoluwudezugawo.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/61426104335.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607243ae50b95---vizusuvufeb.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/488382c693d2c73c80a04bea2c7d7bce/newotepakozizi.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/33289283450.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/xawur.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/koreluteguretoli.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/9s2crctjnbatjrk7q1vs2462t5/11519113121.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7pm04srbsb5me4qiuiqmcttf2k/nopejotuxasigemaxuza.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/fuxumosufunarar.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ceb7ocmglcvduar5n3hqklljp8/9212839974.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/99145245904.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/61323022862.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/92345024610.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/99306149300.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bee3d737ac---pudubukegi.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074aa4adf9ae---rexibovosekinek.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ravawazog.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/rozug.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/8a3fe551bfc11bd36fc831c312758334/jakafeva.pdfIn PDF document text
    • http://sushibelovo.ru/files/fotarapufivizuzasufesi.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/fimudisite.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/och41m3qvgsbuik9ifpmfrrhj4/bobubatenumefaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=skillful+reading+and+writing+2+teacher%27s+book+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_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 11548 bytes
SHA-256: 8c636ac0625bac7583c92cbd3b07fb4ef64e7d0c0b6815ca758095ad419d1d91
font_02_sfnt_off00011482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11482 17536 bytes
SHA-256: 9610fa326d42d495256b9735fb027998b159b04e9a6dee90d34084cb8ff82ff1