Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa1e92b74481725…

MALICIOUS

PDF

96.6 KB Created: 2021-07-27 20:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4261b3db25a08b89885ec0e7b1d382e SHA-1: 58d5f0dc37db0fb3c40f5b407b512c2dd68e4589 SHA-256: 9aa1e92b74481725c9667e38b942a7dc6133b2205c488190db2cd560e920b45f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The embedded links suggest a phishing or malware distribution campaign, likely using these compromised sites to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e98fb673c---xosirepefepuvatexapamosi.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/96299fa7c03c0ddd678d3fb2d12c2bc9/ketukerekuganam.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ea2045d36---kosawaluk.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/41207f57937ed46521a6b362dd19a2ef/pejozemupobefijivuvilifat.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609be4191e38b---76142977033.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d0b57b0c4---juzigatago.pdf
    • https://nasselgrundet.se/anvandarbilder/156/files/16623061676.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91cd07dbeb---telibabifimewejumobuf.pdf
    • http://webhenevents.com/clients/868374/File/7572695509.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076024a110a8---37814363415.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/31508edb5250e0abc58571eb06aa919e/51601757635.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757dcd31eed---vedodanakotexuluxexis.pdf
    • http://eska-lift.ru/userfiles/file/17736587541.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4e4e9dc4d---gixemadudewapifojima.pdf
    • http://www.prieteniitehnicii.ro/documente/file/fotika.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4b5f5170a---misikojaralota.pdf
    • http://ccsl.asia/files/85293654031.pdf
    • https://megalightgroup.lv/uploads/files/93456208854.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/2igbtj2pqg477fs3p91t6hn4cu/64141683002.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/etl4b357btlgsso36rk6q87rb2/75612808487.pdf
    • https://menlopark.com/wysiwygfiles/file/78047196065.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979c4abded2---fezinomimigigewere.pdf
    • http://n-production.com/upload/fckeditor/file/juruxosujipazasenopebefi.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160922440db954---patepe.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4539f2e0765efdccae6461d52144c2d1/98959406093.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cas+project+ideas+during+covid+reddit
    • 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_off000112aa.bin
178e621af989b9e6a1dc23adf6eef1f8159e4149ef8207f1d2ce169413b47e5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112AA 18200 bytes
font_01_sfnt_off0001426e.bin
3bf3530dd61490b50670603bccbe8203ad7235051b062f81f74a73ff3eb0f77d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1426E 10972 bytes
font_02_sfnt_off00015bd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD3 16792 bytes

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