Malicious PDF — malware analysis report

Static analysis result for SHA-256 928eb5e51b8f6a6e…

MALICIOUS

PDF

82.5 KB Created: 2021-05-15 00:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6a4203c5455cc8a34b6fdbf945df8d7 SHA-1: 12ec1ee675d440c6185290cae2e93dcb1750bd97 SHA-256: 928eb5e51b8f6a6e2fc997326d115803634d81f67e76b2289bd47e3c79c56cd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a link farm strategy on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/f6rra9q1guj330vvlbr1945061/kijelibinuke.pdf
    • https://silverwayshipping.com/userfiles/file/lipubikirenijorisaxe.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/879hliglnl4b57cr648k2npgds/gunuwoximowovot.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3f797c9ec---43346088318.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702e7be9ae6---vopugagubi.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/7n2hg4l5s90un7ejg1tvt8ckm7/mawikogapefafofomiwowe.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/43i5k673g265s43ccl59of32hv/33735759718.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4a0502647---54021341145.pdf
    • http://accessiblevehicleservices.com/userfiles/file/rowekilutoxadesizafa.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072cec053261---55936484739.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/61tn9ohcudns5ficuvbo36fbvf/4989705396.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9eca3e77---sajexoludedesifuj.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/d0fd31e713b9c3947d4ad43aa9300b78/guratotivugixixute.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2016ktaj1r7jpn4hlgcphvgc95/bulelezolakuwusasirixa.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/a444fcdf4d851d2ce5ab710cfcf76672/kefimoso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=equation+and+inequality+word+problems+worksheet
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffac.bin
4cf57d50396c450663b43810558f1afe030bad81969aa3617790c75f5f286cb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAC 5680 bytes
font_01_sfnt_off000112e4.bin
3d312e9ee52dfab4eb6b20a149ab4d6f576befcceecfdc72abd1897f22ccc271		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112E4 12360 bytes

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