Malicious PDF — malware analysis report

Static analysis result for SHA-256 462855e317277537…

MALICIOUS

PDF

88.6 KB Created: 2021-09-02 17:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c62687830eeef1755eb2e5a798b1795 SHA-1: 9d7b86cf85f56add072caca127ec96955b27ea29 SHA-256: 462855e3172775371a3c517e2a4a36d239cf58c7d2a313f393ce75ccf0dd73a6
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610db0247a0b5---tirawukep.pdf In PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a945b00c70---fonasotim.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/42951465039.pdfIn PDF document text
    • https://shopabrang.com/images/files/vamirip.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/28029290508.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/040405352537.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cf8457eb4534fca91e882c6929ac805/gofazibagusosobasovug.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084b69a82227---foloxu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/vinovodasigemuf.pdfIn PDF document text
    • http://hrudolf.com/userfiles/pebeviperifasawisetuked.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/ralokamumubenokotojiw.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/94146249686.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-21/20210721200731228408.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9083447534.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/78413330650.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f126e67f4643ce8291e1af4a55e7e9fe/75317863958.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/dinulotejijojewamowilasu.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162571622136702959078.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daa5cdc32a---51014271844.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/refosomusosafu.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/42247797969.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/4262969ac433f4d9024453617c4173d9/suxokelek.pdfIn PDF document text
    • http://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/bakodaroredeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=handwriting+without+tears+a+plus+worksheet+makerPDF 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_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 11108 bytes
SHA-256: a7cbe7f28110749c4741d0721bf69a60e23e318c4a187aea6ccd6fc14864cf56
font_01_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 19148 bytes
SHA-256: ea412f6b358991e5404a2d503f013e3004c35f6de4c482d7facebbf4247d5151
font_02_sfnt_off00013c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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