Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de830fca892812d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 02:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 546b20ad40a7ba243f9e1d627ffb8954 SHA-1: 2ddd60f14952b6ccaff0e0a920688a0a8c4c2e36 SHA-256: 7de830fca892812d5f3ba53126c1a18b874723c3c5dbb6d73a5b110af8f24f7e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous unknown domains, suggesting an attempt to redirect users to potentially harmful content. The presence of compromised CMS upload links further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/fomafipexipipipad.pdf In PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/bururexebofewetoli.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137108c1ec2e---8304654749.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091605571470554.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/niwipowozigilanufexunofib.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/19023318886.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/99264063487.pdfIn PDF document text
    • https://everestart.com/images/stories/file/febunezekegud.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/xezunekifabajigumozejor.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/97533445809.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/37882635841.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/21555830096.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/basoferapelobil.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a8763117c3c4a9a68ecd7b9bae897fb6/99678325962.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/tajudafigugegutetukep.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/31205631213.pdfIn PDF document text
    • https://12waktu.com/contents/files/41692942127.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da922bd8d6---44552026252.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/e04784ddd4fe283f6adfe412f218fdfa/vasevefudenupi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161387d526a2d4---92196700427.pdfIn PDF document text
    • http://orderkai.com/uploads/files/gunatodiw.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/novaluvugusixanotixixefo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc7353512a---nejafunexugebebarezif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+connect+android+device+to+tvPDF 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_off0000cc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC17 10292 bytes
SHA-256: 6023713ce08c3739415f12981623d09423566e3bea3691bc94d37b54b3dc11d9
font_01_sfnt_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 17420 bytes
SHA-256: 190d71e40d66d44a21c800afb9fdb8dae70a82888584a5ff0d7b170b1bc2a5f0
font_02_sfnt_off00011072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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