Malicious PDF — malware analysis report

Static analysis result for SHA-256 16aacd898d4d8586…

MALICIOUS

PDF

70.2 KB Created: 2021-09-07 06:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a879cac0c4a385e3ceefaf01a3cb39a0 SHA-1: 0faca9bb7958a37b2b60b53313766483735587cc SHA-256: 16aacd898d4d8586ce1cb90a3de19715d15371f9c40574a6bc456e539dab6b17
124 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The presence of numerous links on disposable or compromised hosting suggests an effort to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b65052cbdc7---42816287197.pdf In PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eff767233---7667871910.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210714111854.pdfIn PDF document text
    • https://plasy.com/uploads/file/61164609484.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0653ca367---bagugegonaradoza.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/gewixuxid.pdfIn PDF document text
    • http://isitekmuhendislik.com/userfiles/file/ruxurebusal.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/50207145824.pdfIn PDF document text
    • http://novichiha.ru/pic/file/49469797429.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/124a6f9a0575e140438349ef489b89f2/vepor.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/wulesagoxogebibunoturoduk.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160744653811d9---zamaxazeroz.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/78329405595.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/80215844890.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/nogubowalebi.pdfIn PDF document text
    • http://www.toptehnik.si/images/pipuxusi.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/5187815654.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cbcb25d3c---kuguban.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2bbbeecb---verizokolepuperige.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/dafaf.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/dugisowizajinedeviw.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/26528243208.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/30862896112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=delonghi+diecast+manual+espresso+machinePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 11060 bytes
SHA-256: a3b2a18a8ced800fb0c04e088baf2a383078eaba960424dcf0a5e94284182f3b
font_01_sfnt_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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