Malicious PDF — malware analysis report

Static analysis result for SHA-256 b365af30f8342667…

MALICIOUS

PDF

95.5 KB Created: 2021-09-21 20:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1ae70394f47afcd25fe280229cec904 SHA-1: 30d8fb4aec5583e407d9da3fa3528ef36f7ba768 SHA-256: b365af30f8342667f3e6e2b4286f08149a1d0e85e469337bbb83b42075fcf796
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, several of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves exploiting the PDF format to deliver users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=mountains+beyond+mountains+tracy+kidder+pdf PDF link annotation
    • http://flamefitnessstudio.com/cewit/images/file/satolob.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/37867057682.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161416a7c10436---lufajatunufenewexobenov.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/lowonepumonaxezaw.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/vigovexukovoraredusubogap.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/mupivimafeti.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/94886889217.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/25872165456.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e8fb5b60b---fufamikifefupusilamabano.pdfIn PDF document text
    • http://taociren.com/upload/file/210917101740575877g85l92agnt22.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/dowojuneberibajozej.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/nujuzumodavariz.pdfIn PDF document text
    • http://panova-art.com/files/file/modes.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/76280547592.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/nelogukabitubefovomixaw.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/mivojuba.pdfIn PDF document text
    • http://dsfly.com/uploads/files/79371824014.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e48b7cf76c---37788798285.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/zositikawebevigiji.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614274c44c98a---jufaxitavatidepeveb.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fccdf6369e---vakax.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/supogadubuwonewakoxiregud.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/dajajive.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/9657442739.pdfIn PDF document text
    • 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_off00010ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD5 19700 bytes
SHA-256: 1a1527bbbf3c2717105bdec404377bde6d84cddeb70ad9112d6674a891b38161
font_01_sfnt_off00013dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD7 11176 bytes
SHA-256: 5b63dc4b128a222c9c6419b1b81c3df7b03c173150d5a3f56869b569bc5d69e7
font_02_sfnt_off000157d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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