Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc877b55c2d9eebe…

MALICIOUS

PDF

93.3 KB Created: 2021-09-07 20:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a001ea03fd9979b9dd468950672bbcc SHA-1: e177a6110f8eee019c69ad6f118e82e759f19337 SHA-256: bc877b55c2d9eebee3068b35242a4efc4febc24b8f13f6151d6141dd914e7c56
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://wastran.ru/uplcv?utm_term=crash+course+a%26p+worksheets PDF link annotation
    • http://chornakorn-packing.com/ckfinder/userfiles/files/77208263356.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f8846d49---65912340672.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608755da3d774---11393866119.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/50878849090.pdfIn PDF document text
    • http://healthywithhart.com/res/file/37582979804.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/35467030328.pdfIn PDF document text
    • http://chinalabware.net/d/files/jifeb.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/nexewo.pdfIn PDF document text
    • http://mebco.ru/images/file/39523053548.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/35482200581.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fb1f19206---99363649107.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/1947541888.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/34167965940.pdfIn PDF document text
    • https://la-klamm.org/Files/files/97492736209.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/27205485056.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f85127452---52364857245.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/duluxemipilevone.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16083661998d6b---jasiz.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/tiburidulakemaguwizeg.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e9e3e8ec2---wobupidobapadajitulebi.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/bodisawawiparekuma.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/45570664383.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eaa61d407---31817361314.pdfIn PDF document text
    • 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_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 18908 bytes
SHA-256: c68caae76db1f5b20e845f84c636eb4dabfecfcb8307c0150f8ca29d729e0db3
font_01_sfnt_off000138fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FC 10116 bytes
SHA-256: 0266331d5dfdd8b8a13787ff16ae736595a308d61ec1cb69559bf560d7af4c83
font_02_sfnt_off00014fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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