Malicious PDF — malware analysis report

Static analysis result for SHA-256 95bf094a09249ae4…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 17:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 671e055429a702b3c201ba83e680ab9d SHA-1: 83a7e1337b031fb38e9f52d730ecd1453f7f98ec SHA-256: 95bf094a09249ae40555b31828357317190e6364a1010c90facd240071513dcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c77d75c5b4b---55337897543.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161318f8154f72---87203471201.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbbb7d625c---bimufirokizi.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/gikopuzoboxumobemaxodoli.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d2a31c439---momuwevasixatadimovi.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/99350336583.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ir3u3fs571723p1pss1mpkauu3/sotudasozo.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/40042081716.pdfIn PDF document text
    • http://boxethai38.com/upload/file/68197863368.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/57d72239a92e1b4b17d0b11aea897828/wededufedu.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/0ccf10267041fdd8120bed141aac50c6/511679087.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607167c72b190---xozaxaxipofukitomuzej.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/7106537973.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///naxesenogagufi.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/5089332596.pdfIn PDF document text
    • https://samowar.me/upload/file/lumagezemiwanokezuvu.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094422979ce5---fadasutebowugif.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/rururula.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/843fde1b0bdcad59560c71bcf62f2bd2/31180342498.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/megemanodekatis.pdfIn PDF document text
    • https://lesura.net/userfiles/file/20851514017.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16123cae948db1---wuvoruwukunazukaz.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/43868599139.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/13213d19676a9b6fda1385e8efb04a15/51113390356.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/2878365657.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/90344078136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=math+expressions+word+problems+worksheetPDF 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_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 11072 bytes
SHA-256: c44b2a9df669e4fe75857de3376e9c2b89db68ef5e86fb04467f2e53cdc2ba0f
font_01_sfnt_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 17560 bytes
SHA-256: 9335d3661f1c0eb06bbdd6ad258bed2d3a5f074860d4e6100154d832c4b1981c