Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7709cb5ea8cea93…

MALICIOUS

PDF

106.7 KB Created: 2021-06-29 19:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2e88ccd4ecb13a999ca1fadc3a4dec7f SHA-1: 6c47225c7fc70bdfb53008ccd0b99ccdba1dadf6 SHA-256: c7709cb5ea8cea9349a61740da117697d96bf833cbab65638e0d6744a558a342
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. These sites likely host further malicious content or phishing pages, aiming to deceive users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://ever0036.com/assets/uploads/ckedit/files/20210606154939.pdf In PDF document text
    • http://topas.lt/userfiles/file/temeruxe.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/65903728549.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6ac46b58f---88418172142.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942d4b2fc27---73484953617.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a853a06e6fe---91331112618.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/kofewimutimaxuwuvumororaz.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/21616525226.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f504db344bf03b063fdc79e0973c79a5/jodarofu.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/814c309e382751b1608c513a279dffa4/33177451229.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160761621a0e11---bupegexobijap.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5940f40db---4084705112.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/63330668345.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/fibevufajosana.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/bigajize.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160919461c2eea---78938137187.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/29072623897.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2lr0bvddktmk0po053oo2kv4mr/zuzewaf.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e52cab2683df083517ff435ed231a23a/76418297519.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/dopifofefutazakatemalivuz.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210620002824_8et7jy.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210618_B6C268E625321678.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/32797479577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=colossians+2+the+messagePDF 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_off0001410c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410C 10604 bytes
SHA-256: d35b77a9cc231b548248a978834ca159f1785c8d919a508a6f3f1185d4683341
font_01_sfnt_off00015921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15921 17112 bytes
SHA-256: 242d75afddae7e4a0086669df64bf3588aa17c85322e6d0e4d2e0c0701d0feab
font_02_sfnt_off00018583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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