Malicious PDF — malware analysis report

Static analysis result for SHA-256 17857514e54f31dc…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 01:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 900b77f71c05f206359d229071f51d49 SHA-1: b8e0104c562ae97a3e7aa5c0e57b229236d99d74 SHA-256: 17857514e54f31dc0124ec963b0e6a44c6bf501c8facbfd96a9a54abdbd415f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting an attempt to manipulate search results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/af1b8f8d19cd35f5aae7cebe1e43e1e0/jakavewakekoginakepatag.pdf In PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/29054948860.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3f9e345f1---47032350789.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/t2us9n2qlrq0vmmiqhpq9it3ja/ninadevajogizawovan.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/kemagewalevog.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/rozidujexiluxatoj.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfbd4ff3cef---8053031204.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/zifufizosikobagili.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/94482627072.pdfIn PDF document text
    • http://apcmagon.com/userfiles/20904009823.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e5ed6e4cada214ca2457018fe5a6925a/rigezorab.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608946fcd18e9---38264661443.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/zerob.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/kujakifajeloj.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fsmkkq6t7b08se3t98bev645dj/85852516981.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778355ae8a1---94657161486.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/xopakarojivefotamiw.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/71f7338ee26a2d228eff74c93426165d/fapaxusogif.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/1t2u8slqgiq8shbsg017g0qset/38189372893.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/fikogan.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20217301350238530.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d0dfff17a3---61371470616.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160949b7344628---19863583999.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/zeboburukotagimetu.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bf6bc67f---77109317563.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/pugoforoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=capacitor+and+inductor+example+problems+pdfPDF 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_off0000cdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB3 11156 bytes
SHA-256: 027b9bfc9292d29137f49560758d5a9567d44d638da280c2c1671905f1f9bb33
font_01_sfnt_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 16708 bytes
SHA-256: e66f6e8f2715eb260358d3f28ff50d89ccdd9fe5c24915893cb38bf2677c6e6a
font_02_sfnt_off0001133a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.