Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df423e898ea4daa…

MALICIOUS

PDF

102.9 KB Created: 2021-07-08 20:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39d9bca76c646f448094412634564ad9 SHA-1: 05963c4bbf8b61f8a452485c2403ff525b402565 SHA-256: 1df423e898ea4daaa753c1597a20df6044ced1f574ea8e620556dbc2a53f471f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is not a legitimate document but rather a tool for SEO manipulation or to distribute further malicious content. No scripts were extracted, and the document body was unreadable, limiting the analysis of direct user interaction.

Machine Learning

  • Nyx PDF Classifier clean score 0.1127

Heuristics 5

  • 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://bobas24.pl/Upload/file/84431869050.pdf
    • http://autoscuolemontagna.it/userfiles/files/jisefugilogiki.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce16ae588c---1861609850.pdf
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/6104906851.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74cd895a6---79622830064.pdf
    • http://duonglaohanoi.com/userfiles/file/8000808234.pdf
    • https://riolospettacoli.it/filesUploads/file/79433583033.pdf
    • https://contabil-fiscal.ro/mm/file/27363834583.pdf
    • http://tdvvietnam.vn/webroot/img/files/sajanipawibugovomotavaj.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160944ba1b0d45---36227680456.pdf
    • http://nowyhotelik.pl/userfiles/file/luvivunajowijora.pdf
    • http://nakajima-ya.com/upload/save_image/files/6290905829.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b79a38f2034---38529937068.pdf
    • https://proia.bg/userfiles/file/12964188409.pdf
    • http://mai-colle.jp/userfiles/file/86886009884.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b374bc7fd0---rawuwezuxojefibuzafabej.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/pc6td73ch07e0pd0rlin3mki6s/nogoxuvolevu.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d91838a1e48---babezukavodofikegux.pdf
    • http://flatadministration.com/uploades/fckeditorfile/siguki.pdf
    • http://ms-krmelin.cz/app/webroot/files/files/zarezarixomulode.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160709caeba37b---40471880636.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ecas6l67kour8qld0o4hrndh54/bexufomameve.pdf
    • http://abwcoliseum.com/uploads/files/67465920177.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=functionalist+view+on+youth+culture
    • 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_off00013886.bin
5b8b5bf36eeb63d4bbdf66a46fbcd370fb57b4baa421ed34c7190893908c8ee9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13886 10672 bytes
font_01_sfnt_off00015103.bin
e9359411ce1488d48a68a4fada62c6e20fda495b79a370b37e28bc3bcd43f77a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15103 17652 bytes
font_02_sfnt_off00017f30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17F30 16792 bytes