Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a13b46da896ea6…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 13:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 12342bdd71389106f0b5435933b9973c SHA-1: 19c9c3e2f9ce26e734e155d0e9ce347671cc6630 SHA-256: 36a13b46da896ea6bef1d6d3d5061ecaea68f56b29199b9850b712fb38c8512e
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, some hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the structure and URL patterns suggest it's designed to exploit users by leading them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://triangle-electronics.com/assets/userfiles/file/78526509707.pdf In PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133292ad576f---74298739799.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/zawikajitememupatozazosu.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/biwalogigurumijine.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a8a2c4ce1244880f4cd640228e1b8ce6/98025215534.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb87669d6c---7297627891.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/mimog.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/46969275754.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/jatupo.pdfIn PDF document text
    • https://fultoys.com/userfiles/57619886709.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/vesedodezowa.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28451974480.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/12040838554.pdfIn PDF document text
    • https://ismart99.net/upload/files/96639164112.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e2da665dfb547976deeb72b35a92989e/mapedibaxejegosuxis.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/49369819478.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/limuwubibimifovapam.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/jokipifasegon.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140913c373ef---68209965443.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/20038370177.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/nitoxolesemepiw.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/29349340391.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613194f917881---dotokida.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/esv7r2o8tlo9vsk4k359dror65/58269730025.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/32748103174.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94038144161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=filmiwap+com+movies+2021PDF 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_off0000e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 18244 bytes
SHA-256: 6daefaad535ec7e0374ea35b46600be7b0ecc7eae82927b679393b1b22dd649e
font_01_sfnt_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 10656 bytes
SHA-256: b9a7a74df78a78bca8d3bddbabf5e94a16b2bfe09cdbbc437644dab8b64745ee
font_02_sfnt_off00012ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1