Malicious PDF — malware analysis report

Static analysis result for SHA-256 faeb582dc771f851…

MALICIOUS

PDF

82.3 KB Created: 2021-08-18 06:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df7b68658444af5d9a623c588f6b1286 SHA-1: c28a85cb550f2e61ad33366b66818efc2671455f SHA-256: faeb582dc771f8519b7c3b77d8545f0cf78cfec7862ff7cfcb1bae7090854b9d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable domains. These links likely serve as lures for phishing attacks or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=problemas+sistema+de+ecuaciones+2x2+ejemplos PDF link annotation
    • https://europartner2.pl/uploads/80040540750.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/25742432809.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/xuzuro.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607279fcad2cf---fumagifivas.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3e8aff7d9466879a67767fe4673a2885/93734781560.pdfIn PDF document text
    • http://bienbao.org/uploads/files/19756878481.pdfIn PDF document text
    • http://alcantara.cz/data/file/wavokagudubisu.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/10/file/20210710_141939_161.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b29f158a87---kevujemazoxutowuzib.pdfIn PDF document text
    • http://jarosi.hu/files/file/lijetizi.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tufigob.pdfIn PDF document text
    • https://kaisar168.com/contents//files/vaxuxilutusebowirezis.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ef1514eb0d5476021562f5b400bac8a9/kipufa.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bc39966c9---96055584639.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a260d96f5---76707099958.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210621_6266C452DD73E2F7.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/gidipolovedisasam.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/rm2ft85em1633u8659s2sj1e39/dazekemokiposexoxit.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/qfadmtk32c4evgmhtj0v3iogma/lebonar.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/20535614548.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/4370969443.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/kidirogugewivi.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085af3e653ff---malekusutelupedanosotiw.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb4facf631---nanemawudibokirusodunato.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_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 11268 bytes
SHA-256: 9804b547b1e8a19d957ece4afb73ff01632593748d7e9a06343bcf065260fa1a
font_01_sfnt_off0000f4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 17428 bytes
SHA-256: a07834c05c877cecde4fa1b7b07a2f50dd911798b7c6ed748c3c62ec0757da0b
font_02_sfnt_off0001217f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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