Malicious PDF — malware analysis report

Static analysis result for SHA-256 2823bc0953d6dfa3…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 06:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e0602b1ee64392b9a8e1c2cb34b5bff3 SHA-1: 5e4b9d1134cc44df1717f428ad119ad8f4ee6204 SHA-256: 2823bc0953d6dfa3c09dc3d7b5efcfe94178abcc50ac0c49b51c13634a4568be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/adfe1aafddd07de1ba0e9775aea044b2/8254273442.pdf In PDF document text
    • http://dzstock.com/Upfiles/file/kituxofasatew.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/69321129565.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea7105b8fe---63850023199.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/77298954740.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/batunakimu.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/nujejidubapirejire.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/lonemotuxunevusexexawu.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/aa6u75j24op7rj8lafmn2ru7me/gidumatakozip.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/vikesowixilepeji.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/34819690475.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/56beafdf296b1f33475919bf962233ee/zekazox.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/laburotuliragipo.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5500b2c202a12c5829dbcaf9629fbe68/jojujakutigaf.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/bujatilafulikaki.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/6d4cd9d8c1593dae43e54dbc57df85aa/xumenovowigilejewinaji.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/86045151808.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be46a86481f---64421313194.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610dfb28ede5f---86724709483.pdfIn PDF document text
    • http://sdds.be/userfiles/file/domiguwonirosovaxogasuzu.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/54410691672.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/77df5d4f0bb95ca1e9fbd92a2e530b43/47592287027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bright+side+puzzles+with+answersPDF 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_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F5 17772 bytes
SHA-256: 0c54b6159a7e635f2b56d7eea775000e6c3f9ca6070b433a0685b742254f7463
font_02_sfnt_off00012147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12147 10852 bytes
SHA-256: 9627cf2435f1cc38ccdf31df2c6090ca956e3fe0aced3e06eb20a03c553b3441

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