Malicious PDF — malware analysis report

Static analysis result for SHA-256 8015aea175d4f484…

MALICIOUS

PDF

88.6 KB Created: 2021-07-08 01:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30a5e4b11545c50208e68bd5ecee81ef SHA-1: 3df7caa849428113987eeee9607fbb0631df0b6c SHA-256: 8015aea175d4f484051f247f9cec2f369ff51b93801cc09450d336bbee7f1a49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/vjll2bbsd2d5kcl9gj6oer0gbh/mibiforimovija.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a149a4d8d6---97722183182.pdf
    • http://pozitron-s.ru/userfiles/file/kojurokevulerem.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8052223953---xakoveme.pdf
    • http://sowitech.vn/upload/files/wisogijojesasiwupebel.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e017bf19f06---81095567116.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/eu0t71ijhfao53v9oc7eoqbka1/widutedulerunoloxosu.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0283dfe79---zofirikas.pdf
    • http://titibbs.xyz/js/ckfinder/userfiles/files/jokumezidutaretituvin.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97abc43c6---narezemuwuponitawoxemuno.pdf
    • http://foodchemsino.com/d/files/vudivegamibi.pdf
    • https://slide-bearing.com/d/files/87503269668.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/tgvd418rjdcepveqrkkqedtfv8/mapusititafod.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2578ec7daad3b0206d14074a3deea539/34141871588.pdf
    • http://envigest.cz/upload/file/litelagenomunuzaw.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3405a58e09---fumiwenuwaw.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/880d43c9ceee9d4690e796b27bbbbb6f/daduwu.pdf
    • http://safetypath.net/cms_images/43249599200.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/caaeb6f3850645214ef3537680688a45/93482075055.pdf
    • http://reikihaus.com/clients/75291/File/jogufe.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0fcd6a80d---zufar.pdf
    • http://shukokai-voves.fr/userfiles/file/gokuluj.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/vozuz.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/qesi1v0h6cp4v3nabhb72kq1c5/vesuruk.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ethnicity+meaning+example
    • 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_off0000f7cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 16792 bytes
font_01_sfnt_off00010fe1.bin
3590c1afd68b229f352a0d0472b52d7e67a913b406b924e4233b5e6dd8a27fbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 17384 bytes
font_02_sfnt_off00013d6a.bin
85c772d66f937a914d56daadc82e925e31a8270f4275df6e54ea17c582ccba12
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6A 10632 bytes