Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af76869161de9cf…

MALICIOUS

PDF

88.1 KB Created: 2021-08-11 02:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 711f2d286fbd7449a9964ca7258e4ba7 SHA-1: 10c6989adb7fd715c71deee9ff489d3312bfe21e SHA-256: 4af76869161de9cff73725ae8e7b6273d1a3b55efdde52c090c28715a5a3d227
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://philabc.ru/uplcv?utm_term=dungeons+and+dragons+descent+into+avernus+pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abc4b0183f1---93013500827.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b108474c791---wegefuxol.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e66a8bbaf---47882665160.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/p0ffkpirt10kidljslihalhoe4/puwejidunedasunumofu.pdf
    • https://2acontractor.it/images/file/53449961378.pdf
    • http://daindnc.com/fckeditor/userfiles/file/84174483760.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/2cchnbtu80fol8usunl7cs0eg6/pabujonavemevonugegaleri.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080c99073c06---jawewedavixuduzajovatesef.pdf
    • http://eksan-ltd.com/userfiles/file/31136507684.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099326b3743d---rowilebikolumob.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c912a1365---satepoje.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897a4ed7e27---67904376082.pdf
    • https://huanghecables.com/d/files/51128678216.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b22778ca9---xalevovilepemuripega.pdf
    • https://ringid.vn/ckfinder/userfiles/files/korefi.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ba976b46---74804123293.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/q9p6405sc98qctj24dvqdfk5h6/vaxomubovifixosivijavurik.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610fa1d468212---tekawajozalidatajowos.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3995ddeae2064dc2019ff3dfe418bcf0/31530083911.pdf
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/27583750406.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785800c31d1---93689654085.pdf
    • http://darec.sk/files/files/derabi.pdf
    • http://videofilm-tv.ru/content/File/busalazejikotagigebedof.pdf
    • http://ya-ke.cn/admin/upload/99100744780.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f34d.bin
de31d5bdb56ae70225ea18a2fec96dcc92556baf5885f2abb15040d4a3ef3f2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 10916 bytes
font_01_sfnt_off00010c99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C99 16792 bytes
font_02_sfnt_off000124ab.bin
1bef5ed97ded2f32c3ec7f9b1bc212cd78a88157e53d5b402314db110ab614e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124AB 17312 bytes