Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd79264d6f522796…

MALICIOUS

PDF

90.2 KB Created: 2021-07-02 04:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 038a1c4b6b57bd1e131cf5962deae954 SHA-1: 38b2b7f5930603cae9001cb4325c03594325dc24 SHA-256: cd79264d6f522796c008c3fb71edbda5b18bd27cf2506ea7bc3722d9b129d828
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The embedded URLs point to various domains, many of which are associated with compromised CMS uploads, further supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3cf137a211dbbe61f3d58e885c62d04b/wirek.pdf
    • https://vestol.bg/files/file/40042810044.pdf
    • http://joewhitefamilysite.com/clients/59967/File/13046632871.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/949afb03a84ab16239c46b8b2167a927/23191508687.pdf
    • http://delannahotel.com/user_img/file/95147772334.pdf
    • http://rotarylaspalmas.orgdocumentos/file/98885081832.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ba336a7dd---nukukef.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/dc89fde38dc994596b7eb7e63342b627/jaxoloxunemojobule.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bcf8c2b1a---37912321981.pdf
    • https://maintogelonline2.com/contents//files/gevojenalojonulowogula.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8dbb1d4c4---lodukokenu.pdf
    • http://cec-intl.ru/app/webroot/files/file/95319455776.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/dovpai1if6s51sjt4ctlvc79u4/nedudedu.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/68de07e7e781511aef2aeabd181708c1/7349562065.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e618f3733---70792796412.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082d621a44f9---kurijiwa.pdf
    • http://jedwines.com/cmsCart//upload/file/sipovepalanowos.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/49dhrfb3lqujon6gkuq9mlks93/92660797635.pdf
    • http://surtek.biz/image/files/20150205_050255.pdf
    • http://domusanna.it/userfiles/files/52968705656.pdf
    • http://kaupa.cz/userfiles/file/66954448566.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7409323a---49724446747.pdf
    • http://thegioidahoacuong.com/uploads/image/files/75285573603.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/580adb4994f4027c7ce250fca21ad72d/ponuw.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b854ad4ad92---pepofozirosagofifizalu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=exercise+on+tenses+for+class+8+with+answers
    • 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_off0000fdc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 16792 bytes
font_01_sfnt_off000115da.bin
39f2544ac0535ce2948a829339593e15eca62ffbb062867fb74b87fdc5bdd84f
pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 10812 bytes
font_02_sfnt_off00012ed0.bin
223f3caa6aeca81e5674c8177fd90eeec82309b4e472036de38e30b16ea8b9a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED0 17028 bytes