Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ff798c33e59a67…

MALICIOUS

PDF

87.3 KB Created: 2021-07-01 21:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fa9aa5dc45802ade97e641d143dfc97 SHA-1: f7887708f226792a3a96dd9778524ce057f0ab2b SHA-256: 95ff798c33e59a6787722ee834fd6a08cde0c1998bd4f939dcb7cc78b027d53d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://astro2sphere.com/admin/images/file/5724307637.pdf
    • http://harekatmemuru.com/images/Media/files/sapobuxixotedago.pdf
    • https://bodymason.com/user_uploads/files/56729489904.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13638423525.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607066766229d---27504673220.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d78904e1---31943923206.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c87b52016cec04fb49dffa3d3d069fc4/ribebuledovexi.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7d765bd0b95a38468fc99806dfc5c1ee/fejujuxoxej.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5d0822f7d---waxenukipuditivediraf.pdf
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wunanolurobewamug.pdf
    • https://bloomlight.pl/_bloom/file/pulenimubegujowa.pdf
    • http://easyreturn.store/userfiles/file/sipefolapewumoripawijabuw.pdf
    • http://writtenmail.com/upload_images/file/34747651204.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/dcdff7b09095d986602565b20518290c/91240244844.pdf
    • http://zae.me/datafiles/file/xipowinoxanoguzanuxe.pdf
    • http://kwartetproforma.com/userfiles/file/68381616973.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/dc56c1bbddf474da43ab29824c9cd478/13928370293.pdf
    • http://holidayinntorino.com/userfiles/files/61782387924.pdf
    • http://asustainable.com/global/file/kuwej.pdf
    • https://asthasupermarket.com/userfiles/file/taliwerejir.pdf
    • https://alshaabcoop.com/userfiles/file/30105495225.pdf
    • http://infinity-pro.ru/userfiles/file/kuzonalageb.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c84395d369---55064377404.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9ab93987---41563054865.pdf
    • http://www.awakohchang.com/image/upload/File/3916966842.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=short+notice+resignation+letter+due+to+new+job
    • 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_off0000f0d7.bin
141473d26e2f22bf867c83a0fc5be96934e4ce06ef173fbce2c13ad123c88a25
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 17804 bytes
font_01_sfnt_off00011dad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 16792 bytes
font_02_sfnt_off000135c4.bin
21c03c2496c3e4658414580cd14c20bc2722cb5bcc98c50feb6616eadf8bddae
pdf-font-stream PDF embedded font (sfnt) at offset 0x135C4 11180 bytes