Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d668fcdc300cbe7…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 19:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e66adf9751f76c43ffa9f5d16909573 SHA-1: 0de4a702ba851f1c13f7211c36d6ee6a753db097 SHA-256: 1d668fcdc300cbe74e56b911ae6fb2c1521a824a9f962936bbefa5741e5e1570
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/kjljb8tidkf4d24mh67cq97u6s/60436469434.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf6cf6f875---lonobudufupoxe.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e29942db3---58223138795.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b061434b39e---kuxex.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e60c2dd5d33f32bb53c059a2173e6832/15967350518.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4he4nqvqhcolscmulc28qevgr3/sapixi.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/afc3358cc282c816fe080cd660ec1d8c/98397573883.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/emu7719bbdjaan7s3bm46t9let/12568734730.pdf
    • http://worldnaturalfood.com/image/upload/File/lodurebepexapupugemuja.pdf
    • http://cloverdiamond.com/file/wavopafojefurezinuviv.pdf
    • http://nicolalazzarotto.com/userfiles/files/gupagukisolomapizaw.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9e50b0dbc---levanelegikekam.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f9a88bfcf---wedaxexoseni.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077649b9e093---ruleguxina.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f55f53d57ebf65094572a9f943bd8ea6/29181612349.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1cbc294d97f2bc0e142cdf85d0ab976d/lijor.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/67f6a944bd8eb5a9e57cc23df8231e6a/59749707009.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/bpnocus0c3j4114n9eo0oohfdk/83568329613.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a19bde56492---2978594584.pdf
    • http://diysmart.net/userfiles/file/79231635164.pdf
    • http://box8websites.com/ckfinder/userfiles/files/vukafikigovefige.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/goriw.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5a3bc8e6b78c01152a9ef9dbd7053924/43868270722.pdf
    • https://gastriklandsbf.se/UserFiles/files/rezeturetomiribelageperoj.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/wirefij.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/25677913334.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=at+peace+with+myself
    • 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_off0000ee63.bin
908ecca545731523fd0ff3e04abf210730b6a2bed73b878240670aac7f655317
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 10604 bytes
font_01_sfnt_off000106be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 16792 bytes
font_02_sfnt_off00011ed0.bin
c5c71025346aeff86072bc6ffd93de1f22c9272f42c962c9bfc69dc183edfc34
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 16988 bytes