Malicious PDF — malware analysis report

Static analysis result for SHA-256 376e6cc66e81d001…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 12:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b0d4c300230d9a8c19b3ef17570cd9c SHA-1: 14fa713f311af10911486aafda549788b016a14e SHA-256: 376e6cc66e81d0011c54f72e5ae0f62f556fd71f49b4c72cb4775fc5662ec9b9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://fratellifurloni.it/file/11547702830.pdf In PDF document text
    • https://namphuctourist.com/userfiles/file/1596879805.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/4510415079.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/41093963161.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/0551dfe6c1631b145f56dc0fb724d564/tepegosonuwomozoma.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/pimonozozopugenukuvejo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bd3c32ac600163ab31f232ab7a189127/7768896577.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3bcd8780d7c9281a650bb679fb484e8c/zodime.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/xizusaxiludesixato.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/50975741170.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/93891848221.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e947bc2fdb8---15305471999.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/ganenuvuxivadaj.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afa1bddaca5---dexagajevi.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/o196n0fh9hllhi9fo1nctgms2m/zurarezafanojezesi.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/69315220667.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e1bb94f76a---2446239471.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/83290598037.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2737efa1---40241813943.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/49160834401.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/afcdj0qd5g1k7a6114kqptlsaj/93069474223.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/66535182118.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/noniwexufuxegaxu.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/fegener.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/56870363927.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/77320696535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=addition+3+digits+without+regrouping+worksheetsPDF 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_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 10896 bytes
SHA-256: b5e718b5d7d2a3cc75f648068e44315abd6756d80b8de981e47eacd7620733f8
font_01_sfnt_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 18512 bytes
SHA-256: 578816fb335d1d1f197c8a9c83727facdb05af3d53e9dd2319a2ec9c79db761a
font_02_sfnt_off00012afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1