Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e302f80c081864f…

MALICIOUS

PDF

76.0 KB Created: 2021-08-19 21:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 7d8c05a666a410d054553d576e59b451 SHA-1: ca15955a96fb08e52b03775b06e0f205a28231a8 SHA-256: 5e302f80c081864f45feeddbf7ff3283a6815a32c7a189c764454ec2b9bae1b8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a19fcf94544a6a02b17ddd9f91ee87a2/kojamawenaporezen.pdf In PDF document text
    • http://lohs69.com/clients/82366/File/42585632818.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609a71a0de51f---88171093721.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a01951919f9---digewikobitugaw.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/5782650144.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/31066947061.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb1625f4ec---bofebasobezunop.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/mukutiboru.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210522141651.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/vomixikududixofedalid.pdfIn PDF document text
    • https://themalc.org/files/file/28971146706.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/xarepaworevifagaw.pdfIn PDF document text
    • https://razredna-nastava.net/files/16816519057.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c08604d369---wozakimivekamuja.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/masefinutijeg.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/75737997487.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/puriwizorobusoxuxoriw.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/26523195178.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/518fa82dbc4aa3a821f3ecf45f1178ad/razemil.pdfIn PDF document text
    • https://bfull.ru/uploads/files/70971363622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=yepi+3+games+unblockedPDF 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_off0000c542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC542 16332 bytes
SHA-256: e20cc70594dee349ae483cfe9b1db9200af7ca010e5d154590891e8ef155642a
font_01_sfnt_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 11144 bytes
SHA-256: 2843d0c76eb90ade6ed71921e719ce117eef23734e1bc37ba96db481d34c118e
font_02_sfnt_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1