Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a89dbeaaf5568e…

MALICIOUS

PDF

86.3 KB Created: 2021-07-22 17:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ccb7547000c9530315cebc510c2d6cc SHA-1: 06d7188ad17d0d35f215f295e6a6e9ab15693b94 SHA-256: 19a89dbeaaf5568ecf29e2c759f93c4b3a3f39266ce3e0714e1cd56c7918cb36
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or track user clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a960ee09365.pdf
    • http://guanzhuli.com/userfiles/file/56880451979.pdf
    • https://o-dance.com/upload/files/tofevowowozurebizuk.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8710f463d1---16426745699.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9fi3k1bmakb1rvt4ur5g2uj2t8/77101837502.pdf
    • http://www.irrv.org/uploads/files/44666811632.pdf
    • http://gloucesterclassof81.com/clients/23558/File/lokagisagatib.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/slnuol5pppe73dcgc9vb6gjs2a/jumelivumedefuwuxi.pdf
    • http://weberstellen.ch/userfiles/file/bodejimuwuwolazufif.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ka1i85h4kghnpjbpjddmk28sna/68672250170.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608435fb33d79---tiwivi.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa07697348---tuzisekasuduluwejenitu.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5be33b8a---dokino.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c315e5df946---18681040881.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e382f1d9a3---67913975014.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/gf2br0c1daduev1gjd3bqkca47/45795405844.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607197573ffad---fudawuxo.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/1a94bddf8b812078ad128b74e162b47c/livujasepoberi.pdf
    • http://sewakendragroup.com/userfiles/file/1511150862.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16094021deb9fd---tadixizuser.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/bb3318adaf026a847428a7a412a1e12e/kenutedugoreb.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/0725690e5c2b77fb9d6240f209e07c5c/64640024014.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=rs+aggarwal+solutions+class+9+chapter+1
    • 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_off0000ecec.bin
27949db87285fbe75d957d0b63483aabf9d39095ab8324ca76af2b030d689fea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 16860 bytes
font_01_sfnt_off000118fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118FC 16792 bytes
font_02_sfnt_off00013113.bin
cb7969b8eeb21c86606a983678e06079fdeff11ee7892f4c28c3dd4c634b8ec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13113 11104 bytes

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