Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa2875d0a0c12f4…

MALICIOUS

PDF

87.1 KB Created: 2021-09-05 04:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4abef72dc0fa2a9c582f0609bb3c8f82 SHA-1: bded3f8ec740a3b51d57ff372daf88fc2403d095 SHA-256: 9fa2875d0a0c12f473a6c39e0fa7ddec5bdebabbb40d4f061f19acaed150c022
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or deliver further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1815e9cf---77629000710.pdf In PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/jamugutufelewiwaxikamu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086537da4a33---84023547939.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/04572923f830496693ac1fbbcc595bf3/14461166106.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/zevunulo.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/wipisipimax.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b12fe5640c97d9c6edbfeba5dd6f82a9/61323592043.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/bh0kj436kici26hg2fkka5lkn1/69855970843.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/seketufisifeparamuzidos.pdfIn PDF document text
    • http://industrialdevices.in/uploads/45869598346.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/6099242747.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/mmjundf8acuuq9t23pdeje06m8/sirukupijaviki.pdfIn PDF document text
    • http://armanetti.com/images/zubuxofupubi.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-8/20210508183035678253.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/95662398517.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/26321042010.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/derelur.pdfIn PDF document text
    • http://fittbike.hu/files/file/zajamaber.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/3155629100.pdfIn PDF document text
    • http://usmleworkout.com/files/file/mavukukodesuj.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/zajiragefu.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/xavinebek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fritjof+capra+web+of+life+pdfPDF 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_off0000f093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 17884 bytes
SHA-256: 40ebb7812d297d7b7dfaa41405e93826ead14c91aec8e20161da9f801d4fe6a7
font_01_sfnt_off00011e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001366f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366F 10672 bytes
SHA-256: b53e2b22e3af2bf75d20e7dad6b25ffcab60e488cfdd0bc3ce17a85b2850fad8