Malicious PDF — malware analysis report

Static analysis result for SHA-256 c148a52e18233e7c…

MALICIOUS

PDF

86.0 KB Created: 2021-07-02 05:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e0f3ab8102ab09d5dcd61e35d4793ef SHA-1: f609a586bfad5f19e3be48be00252e4fd4c5b52c SHA-256: c148a52e18233e7c16fb5ffc2cfb15097616ebfe11c91027d6728e8f01ec53a0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bjaimama.com/data/upload/2021/06/file/202106030944278382.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/uemi1p9hat7k56l5locn8ui7cv/45197265351.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb0cc7c72d---78049329219.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e3e7b15deab7bf7224b9dcff62b28914/71706420660.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/h27t3i7rh9cjk1vjepgs23vsjr/5791929442.pdf
    • http://www.aadhar-interior.com/userfiles/file/70967396623.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41c6c5e2fb---41162963694.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/bbbb1e7e98867a449466b562a9a21672/guzugikirikubokalimi.pdf
    • http://southport1969.com/clients/861680/File/46477489584.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adb97b3f612---4285293204.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b9f77dd24b37798c90488a0de21aad48/99006204403.pdf
    • http://rotarylaspalmas.org/documentos/file/funafixopereramiwaw.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca066bfad6---kinobojodovexuzomi.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee74f20c20---logefulino.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6f1301794---kovazukuparokojabuduxe.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/eh49b3l1mehl1bvrprsjclagvu/sejejotuwavidosinesozuz.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/299c4221470a909a530daaeb169a1c33/52928112926.pdf
    • http://alimentosldm.com/userfiles/file/27013263302.pdf
    • http://chizclean.ru/files/fck/file/21715436952.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0ddpelk8rlacuhibhfpt5erlfh/70083849592.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5c95246d---lomebavozezana.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de40e25907---50129228497.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7acc50a2ef47f5dad31b94dfccfade33/depabuvumolefadipogefe.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/524aa2d97bf898deb34f55f1ae4913bc/68609190942.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=four+d%27s+of+negligence
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 16792 bytes
font_01_sfnt_off00010651.bin
f3a3d1e050003045ae5eb2ac397d612eec54c31a5e9853336eb08144cba21d7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 16588 bytes
font_02_sfnt_off00013170.bin
b8534878328ddbc6d37100e7368c019d277dacfc00124881cf59688a7ce9643a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13170 10504 bytes