Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b862eed51708f5…

MALICIOUS

PDF

83.4 KB Created: 2021-07-19 06:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bec1f868372c2977152382b37d473dc4 SHA-1: c301e749efe781adba6bb45e0f836b7e90b98cc4 SHA-256: 10b862eed51708f5f99dcdfc0c1acb8246e287413ceb3926ca3e0bad5b252a1b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL targets are indicative of a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609feddaecc7e---mefuvijexifironawive.pdf In PDF document text
    • http://flywings.sk/UserFiles/file/1483762463.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/rejabudawipesupalixitaw.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/8bcd79f02aaf521eba91bc22c4070e61/guvubofaridividiwatix.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/89839093450.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/buleledawinarini.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/defaz.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/60176521717.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1u6sg360u61lv7lc0vknt4vqf0/16130902178.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/h5ohkv3c2sva0auem1g2rn0pll/xuxolejexek.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/88276073393.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/51958634712.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/8f9a2c36d05334114fa98cee25e7058b/fuxulinawiwiturew.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f038a84059---wenutogokib.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/4085658217.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c797a3a249b---25022024505.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/7eb9ca6f2e706592c9431f52b9a56300/77998848124.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/60478348333.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c7fab749d20a40d6e40271059b8d3a9f/42962008355.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/vepojivixiwuraxo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811d247801b---jarijebavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=indirect+questions+with+canPDF 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_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 10704 bytes
SHA-256: 88364bece35e5e8e99632b2f3816757a8e74587521b9770033883f2ef7bd7428
font_02_sfnt_off000112ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AB 17572 bytes
SHA-256: e63d87e699820054bba492735d16a4cfe07168db02494500174b8adfdce74778

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