Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb9db4b2edd05cc…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 01:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1db3d387e293290bc38d31207a58591d SHA-1: f069888bfadb77471788475879cbfb6365956867 SHA-256: adb9db4b2edd05cc706ddc835f7efbae6079670aaa2bdd365e43ae9a2464864b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm characteristics suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://occahomesearch.com/userfiles/files/zewedufoji.pdf
    • http://noahmission.org/dataroom/file/fugipipake.pdf
    • http://odontoflash.eu/userfiles/files/jobofarukizeroxudunigupur.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/28751324974.pdf
    • http://nissanotogovap.vn/uploads/images/files/fuwakalos.pdf
    • http://annabarons.com/files/files/22987081860.pdf
    • https://rent-1.es/ckfinder/userfiles/files/bomuto.pdf
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/rovoxebewodotoxobozip.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614256fa81aa6---45653529394.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613910b0b0d6b---53796703042.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/ludaridufaworevoso.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/fepabizorom.pdf
    • http://arredamentoambienti.it/img/file/dogemebimenoromegebu.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea694c511b---pepuj.pdf
    • http://phutungototuanphat.com/img-tvdl/files/zuvesi.pdf
    • http://khlongtoei-nfe.com/library/userfiles/file/bigasigikotosamowotozexa.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5db10ed50---40492500397.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2da913733d3ee8fe6703fd90bd84e5b7/80662878943.pdf
    • http://karinameal.com/imgdish/files/durujom.pdf
    • http://deurenhanger.nl/userfiles/file/judibazofumirugodetax.pdf
    • http://pc75.net/upfiles/file/1631292807.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/10031868054.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/91276310174.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/40573224671.pdf
    • https://hinodanang.com/uploads/image/files/rugumorosamuj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=remove+unwanted+pop+ups+android
    • 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_off0000b0ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BA 16792 bytes
font_01_sfnt_off0000c8cc.bin
73452d17dee4d048208f6e2e2ea30cd4a84db8094c68ba4278275ac18c817a2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CC 14536 bytes
font_02_sfnt_off0000ecf9.bin
d17269361b0f7c4f822270ac313d9755a82c68952125a5c964bd4546e2fc00e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 10804 bytes