Malicious PDF — malware analysis report

Static analysis result for SHA-256 1816b051213b6186…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 09:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ff4090c9cde7172744532c55e2ffb55 SHA-1: dafd04b0b2348d0c68180a34ef0f7b88a1ca7b0c SHA-256: 1816b051213b61869d96f8d71a5e065473f252df241e43b41ee083bfbfad9390
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' lure and explicit password instructions for an archive strongly indicates a social engineering attempt to trick the user into downloading and decrypting a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://gpp300.fr/userfiles/file/93984045658.pdf In PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0497d7e7c---nurisedonas.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c774a508f0---40072344811.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/sepirutap.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/fonapigiresuluxozot.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/82299147704.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/zaxowot.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210816_DCE23B511D75BD9A.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/nararivisabimosuvaxato.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/06643a85c781a6228026528872288125/mafojego.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc0475624---lanakonuxapegezusogol.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7c112c50---kodovuwaditejofezozoxe.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/36914059577.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/39870696557.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff9236752---setonomagugiv.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/zawipixide.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/vuwezozomabiwi.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/denowisokezutafevijosu.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/51981064656.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/wofosogipinifisolus.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ea186e7f06eb74bb5febf5251bcdd37/bajefevafonipumokadigan.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/84853a1129f96a1401cfd79605a4d77b/jilepupiserinemad.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/6810f54d9b8b23914acb9024c619fd03/83746470048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=engineering+physics+1+notes+pdf+2017PDF link annotation
    • 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_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 18200 bytes
SHA-256: a53b30f380aba62175dfa624b56936ef78dc5cb74254716e4918328f99beac08
font_01_sfnt_off00010c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12438 11132 bytes
SHA-256: a95cff4a09c4901900ac20449d4bb00425bedfa31bb92f3becc1616b73fa01f1

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