Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a18e4bd61093de6…

MALICIOUS

PDF

116.7 KB Created: 2021-06-25 18:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de53328a36208b9004c5975e6dc7fbba SHA-1: baeab2675321d215421521fb49c16dd8c6a4ebd4 SHA-256: 8a18e4bd61093de61d12ada6ec7bc56b8c117a17cca7e6945a2481c6d345a4f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, suggesting a link farm used for phishing or malware distribution. The presence of 'utm_term' parameters in some URLs indicates a potential tracking mechanism for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://esipro.lu/userfiles/file/40541758869.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b98d1ba53---67312125428.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aecf680e27---77984954047.pdf
    • http://whewfamily.com/clients/12004/File/11864493773.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16098442fe9eae---dekadunikovigaxofadipaw.pdf
    • http://iseveranscopy.com/upload/editor/file/73917415076.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/34203308734.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bea2a228ac.pdf
    • http://kaithompson.com/userfiles/file/belapidizivegi.pdf
    • http://driscollandgibson.com/images/edit_images/file/pizuguretovobajevenub.pdf
    • https://tecnicadovolante.com/images/file/68109380837.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8426a08003---bopetoriwavedod.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d2f0ccb80---komijafikegerimizag.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ba331047da84539d9d227640ac54c4e6/tegowi.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160705637ec541---guxalumovitaxezupilovezuk.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a023620f7---70152772765.pdf
    • https://fullmagicweekend.com/ckfinder/userfiles/files/16779951033.pdf
    • http://al-farh-iq.com/upload/userfiles/file/20643122477.pdf
    • http://nowator-zpu.pl/userfiles/file/57790558285.pdf
    • http://pphu-joanna.pl/fckpliki/file/gozabazegekimul.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/16840319095.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608a55bd6c007---pixuwedifuxufuwuxesirip.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ae07ae807---terawanovizinomakojo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=shooting+pain+in+leg+and+buttocks
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000165d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x165D3 16792 bytes
font_01_sfnt_off00017de5.bin
e4667e602a56fe1a82dfb7f39106622381f622c9dfadfeebf8e6a4bd9e718324
pdf-font-stream PDF embedded font (sfnt) at offset 0x17DE5 17148 bytes
font_02_sfnt_off0001aa95.bin
b1a8c583ad7c17fd86d152254d85988e90433d820cbacd9014fca33de48043b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA95 11100 bytes