Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe18b99f7c7935c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 23:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 540eccc58590e8ad9497d202952493dd SHA-1: cec7b6d4412ae85494aa412526cdf73abb38b6c4 SHA-256: fbe18b99f7c7935cfbf8d9afe2615a794f1401d32c67f7acba9dc23dcabb509f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, likely due to its phishing or malware distribution intent. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://catamma.ru/uplcv?utm_term=ullu+app+web+series+free+watch PDF link annotation
    • http://gsmontaggi.it/userfiles/files/mijamekepome.pdfIn PDF document text
    • https://adikketiga.com/contents/files/miramofovitekizuzilunem.pdfIn PDF document text
    • http://dentherapia.hu/files/file/pasoxokojalikajufanonoxu.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139a5e69da---fusonalemabasabosu.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-9/20210909195403945686.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/zezunekutewude.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/suveje.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/zuvufamujuda.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/xigikimepifisalipusisaj.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16132708749d96---siwer.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/musetukimexadilazeje.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/91570214831.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/29656086097.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/o6j5c18o1nigaufib3um0sljfa/lemijilofokop.pdfIn PDF document text
    • https://matratva.in/userfiles/file/vupusevobefasedatasenidoj.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8967cf2ce---51996245947.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/97380386641.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/58339351798.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/juwamudadufo.pdfIn PDF document text
    • http://sungder.com/upload/bugiwerisu.pdfIn PDF document text
    • http://boki.hu/editor_up/15397289444.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/guzepifit.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/daxewinunarojopeko.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_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 10684 bytes
SHA-256: 44e97b376bdf7f789232a7fce76ea0afd5dc7515072497eb6f14e841e9a3c288
font_02_sfnt_off00010945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 17492 bytes
SHA-256: d7d4fa7c27696099f1f049376fe12c439c43618ea3ce22739e8e7316d1bb47cc