Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a81b7b1dad6ccd1…

MALICIOUS

PDF

119.5 KB Created: 2021-06-09 20:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c41f903fc4b497e4b4c5ffb695ffc052 SHA-1: d3ef43807caac7fd26281ade2f5dc966a84399cc SHA-256: 2a81b7b1dad6ccd1c6acc2457bc198a8e95d224a4badb8da2b3e521433d69272
156 Risk Score

Malware Insights

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

The sample is a PDF file that exhibits characteristics of a phishing lure, as indicated by the numerous external URIs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign aiming to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crysiq.ru/uplcv?utm_term=bhagwat+geeta+yatharoop+pdf+download PDF link annotation
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/75bacb58f10e93bc3f114d5ec6b8ee7d/97391995979.pdfIn PDF document text
    • https://rajaunited.com/contents//files/tupodamipiwapi.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/zefaroj.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cde0bcf01---tuzexelupub.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/k4dbbppdlq7o8e2dfradfg1ti4/giwasexavogejupotux.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0712b97b7---xubasabulubumiguviko.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/42632702999.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/20859117817.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/metoditukufilov.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/236d6b8dcb0acd9226bcc1d320c59d31/xajivadugogen.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700e57d53c1---bataxewomunavulizur.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9ac110d3e4ff4af515f3e0e73e0de58b/ganukolotakan.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082f21ee5a81---88159647384.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file/%5C/2021060112023795.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9816bc8d79ff6bbc8b656d5531d973a1/vuxexiresalusivuj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609943072ca9b---66806742954.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/29809300588.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000188aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x188AA 22440 bytes
SHA-256: 2f04e8c6b7b6be1bbf3cb602bbbe9cd7c8f4a96c52b4e742643ad113803a7340
font_00_sfnt_off00012f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F10 5368 bytes
SHA-256: f6fd66311ca6afd82caefeb60fff7078b36054356782f493f3567fadb28658de
font_01_sfnt_off00014167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14167 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off00014cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCA 10888 bytes
SHA-256: 89b30062818bc849b4d9779f002dd59b062c257ea92bd62f79e30d107add178a
font_03_sfnt_off00017258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17258 16488 bytes
SHA-256: 021eaf6e245db5e9796d6b6553760bdf6420435298fcceecd052273e6f7cbf38
font_05_sfnt_off0001c7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7CA 1736 bytes
SHA-256: 74be5bc4d46f64e5c506ae1006f7022dc98ebf960e37c7bf417c2027ca73106d

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