Malicious PDF — malware analysis report

Static analysis result for SHA-256 523de5a56e8e915e…

MALICIOUS

PDF

102.1 KB Created: 2021-07-23 08:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c1039745300c2e0a4295ac7ed561a02 SHA-1: 129e82911c4a780e360c9e1f1529e22d0070bae4 SHA-256: 523de5a56e8e915e68e544d2ba3b158e5933227b4624d8c1f184ef2dc8c6e732
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is also noted as having duplicate object bodies, which can sometimes be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://loveperfectionschool.com/upload/file/wewamasovik.pdf In PDF document text
    • http://reclameindex.nl/images/uploads/33329435884.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/7993601387.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/2ke0r3ba1p9glifunoegnouvf3/zosog.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b9aa18838b8278de54bffaacc05bf29e/xufakaxisavepagomelan.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a0dafbf2---jipoja.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/9ad39f39ecdf5fcb93b9e84230b30cb3/giripunanofexuvu.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/kemurisizugikivupagaxijo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e62d0c24f---42100375346.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/oecaqgbd3l89j044ft6m7op0gd/nedosupejexugimelomofifu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160766f56b2597---25339556473.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/ef6fae5bdb448558bd3ce53d60b1ab0e/luzigiv.pdfIn PDF document text
    • https://ikima.fr/uploads/file/93538738926.pdfIn PDF document text
    • http://immopolignano.lu/images/20615389575.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/kerojagubuxoxapomibi.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/75954376738.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9476456849---medomag.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/bodajos.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c02982dd393---davedugipivoxepavoxaponiv.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/54fa03384b445db599754b292590a60e/24669930580.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf810c759---wikatawavusagizikudov.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/rakosuvilujupobujemi.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/1k86895t8d2lum6lgoqunjus3b/27452633792.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/69094185644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=project+blue+book+streaming+vfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001286e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286E 11208 bytes
SHA-256: 8dff06ea18d6c2bb4769f7b00f1f4ac33bb1df21eb51a70f3cab8f08ae30b1d9
font_01_sfnt_off000142b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B7 17420 bytes
SHA-256: 2ae7c4a4b9153fd13459059c94c6df0d941957990d442d1123cd51af1aabb001
font_02_sfnt_off00017062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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