Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac26893cd4e83ce4…

MALICIOUS

PDF

100.7 KB Created: 2021-07-21 08:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c88e60d172020a20b53999e261200a50 SHA-1: 89af891eeee226a60337376ef36aadcfe6ff158d SHA-256: ac26893cd4e83ce4d080f749d9759432221949ea101c9bd59ea59c72a87667e8
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm characteristics suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://myphamasia.net/upload/files/74074391402.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f93b8a696---lufusavaw.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e56aa3d8e---devokigaguxude.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/nibavon.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c269c4f01f8---63186794131.pdfIn PDF document text
    • https://kawanmto.com/contents//files/bigalinawa.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/adb11bd92de00b482527819a4b65deba/basupojofapizuwivikiva.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53176287770.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/ea3fb6f7639a2a4ed7eb136e1235dc85/8435303609.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/kodigelafudite.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/72563641024.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba5d2e6e0---zegosokazidoj.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/kogobagewebibaxu.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/duriwanisuduranajopibu.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/xubuxabuv.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20ef20fb27---28065935385.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/67716902689.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9072d28e83---nabuvepeneduzoxopowituga.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/r1f4cpdhrlgmfo40n4jsrlvkso/polujixa.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/reramij.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/499f076ddd877da8e9d8822fab542449/84634905060.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083e8b8e0bd9---77266080577.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a1f977221a4fa0fcb800b020655e1667/70931432025.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/65682277092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=english+small+alphabet+writing+in+four+lines+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 1728 bytes
SHA-256: 8bc175f4a4f5cac64792babdad517d65aba3552260b022de7cd4c86cbad4686c
font_01_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 11252 bytes
SHA-256: 1de9b8d9c6810c102ce3da9f8306c8319ba39d2bdf5cb200686b56f4ce4c2ff5
font_02_sfnt_off00011eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB1 20956 bytes
SHA-256: b17e274af9d9c04d725a5f3d0a832e47152c608ab0f7eaa591fd6873b8821498
font_03_sfnt_off00015610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15610 16316 bytes
SHA-256: 5cf0de6f0f1bf7c9ee26470d13ab72a013cc096d352bcd8044c71f8cbbddcd87
font_04_sfnt_off00016c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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