Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c19d11cff4d80d…

MALICIOUS

PDF

90.7 KB Created: 2021-07-23 08:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16d9283252a4a9a13833ca00fc724cd2 SHA-1: f2bb19690371c918ff70b93b77ceba1976d96220 SHA-256: 16c19d11cff4d80dc79f9ef650e79e91d9c48054fea3542eacece1c5e14d6e5c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests a broad distribution attempt, likely to lure victims into downloading further malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://curry-box-deluxe.de/userfiles/file/11198982967.pdf In PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1926c59ef---lobevifemerutesivusil.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/matagititifasolil.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vefefewexijopuxutuki.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/11241040483.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b91c0327977---modulidebaguninipokugaze.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/toruwoborosexuxufewevu.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864c6c74f4c---domamisixumo.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/22305837524.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/8cd9ba2cc43c842e1da7718f2ff37df1/84728420762.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/16524005419.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810b22ac4c0---67771491176.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/99205897365.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/datogediwoluduw.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d143c72a955af3c62cf31d08953308a4/61808902748.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160719b0f44b03---95349013036.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/deweg.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/fg0m19m3b3sfm7odfsdpai0st7/lijupifadulipemupubodaz.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/tepuzere.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f3cf59ebf083d1b1135c03537cf1a516/70999861071.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/70548803190.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/15015966688.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d172cb9f6---60532302087.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/33824914625.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/26389629430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=metrics+and+measurements+worksheet+answersPDF 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_off0000fd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD74 10860 bytes
SHA-256: ee21717ee5f6f54017a3d4e226fdc5f1f497c8be8766e82d2ea78dcd247b4e43
font_01_sfnt_off00011674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11674 17048 bytes
SHA-256: 16217d438d8367fe0058bbb36ce7f15306b5cd871bdf0f37f4fa458084cf05ff
font_02_sfnt_off00014337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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