Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d3da422b771de9…

MALICIOUS

PDF

97.4 KB Created: 2021-07-29 14:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f65c0b5d2a4b3d46cfa1a2195b8d629c SHA-1: b6a767429e9bc61f97a39c92ca9dac193c0fc445 SHA-256: e8d3da422b771de9e71bea700bdf5bd9415196de4c9348e4458e09be81aaed48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript further supports the possibility of malicious code execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=super+fighters+soenix+unblocked+games PDF link annotation
    • http://lyzjkgm.com/d/files/gezejejosenuxasutalex.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0aeab9df7---sowegu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4534ae168---xedediluroperirarapi.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/zifepilafalem.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/k7mlkttjd5upaialh2oms5bgu1/48895110763.pdfIn PDF document text
    • https://tsegypt.com/file/genefolakiku.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/66314958014.pdfIn PDF document text
    • http://asfalon.com/__files/file/29306487100.pdfIn PDF document text
    • http://lblussana.it/images/file/10324884027.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/236d2e33d6d80775a7496500f417a1b4/pexajotulebumafijupe.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/vijosuledimix.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/5jn16gdsteotev460nclppa1lq/malivawenebiri.pdfIn PDF document text
    • https://soechi.id/userfiles/file/90515346976.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/0nrd3o23a1ogot1u1kr54l1j84/84586667286.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/9b6d62988e97b83bfa0830d5bfa023a1/rikiruzez.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/netazuniwawetadowu.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/33437580333.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/bokegozimalisasur.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92be458c5---taninewobelixumi.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/52961560296.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4affd8c12---dutarabafojeburopo.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/dejetapinafisakezozodotu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb1b8ed65d---6212894168.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3e371607c9573a1a55ef4c5a7461a140/34441563314.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_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8B 11576 bytes
SHA-256: aa87482775a3ccfc5fc93eed46c60791e6739d7068fa304da26bbd3f11ecfd80
font_02_sfnt_off00014564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14564 18480 bytes
SHA-256: 5c5772d1f3a83b2171be43ce0d3efd574dd1cfa830c0809339350363f56b2d28

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