Malicious PDF — malware analysis report

Static analysis result for SHA-256 d370b8dcebcc8fc4…

MALICIOUS

PDF

89.9 KB Created: 2021-06-30 12:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a39626d19fb6668201fbd6165e0a2e81 SHA-1: 0525112dd3e653b0cf2c469808b92dd173ed5b93 SHA-256: d370b8dcebcc8fc4b1731fb7618fe0b015c0c68bd24171b578b5ca948d50c78e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDF files, many hosted on domains associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure itself is designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://chp-travel.ir/data/file/lozojemavafanukupegizuja.pdf In PDF document text
    • https://satybharat.com/ci/userfiles/files/46328395744.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/wegudalowid.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/jilekixaxufinod.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b5610a86bca---pobedof.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210526152609.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe8a73b7b9---bopevazububona.pdfIn PDF document text
    • http://heizler.hu/files/file/voruxulixopukibejenud.pdfIn PDF document text
    • http://falerisztika.hu/tmp/zotoret.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737b4be98ab---pupuso.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7ua3k1u3l14k3kb8i06c2qo0e8/dexuvefukeziki.pdfIn PDF document text
    • http://renovator.cz/files/file/52011317166.pdfIn PDF document text
    • http://jarosi.hu/files/file/wutizoloxi.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/miritawokuzitivu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37f7ecf15---14834042975.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/83836192354.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6bd3c82e5---xokuvax.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7261c9de49---febataxarinova.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/3b1ec9f11d7623c44ef9145c584a14d9/96077305679.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775e77cfcf4---55014056791.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c95afc56e9---10159581836.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a6abe3e08716136ae08cc996d67e7b48/dikapafodesupitukogos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=indian+red+cabbage+slawPDF 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_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 18456 bytes
SHA-256: 5752c46cb5b42fd4ed91ebe90dbc335271704091fe354984fda7a2288cc6a1e6
font_01_sfnt_off00012af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF7 10504 bytes
SHA-256: 30331f9dc0ecd5343e92adb196cdb2d8678da3333b8fe26339e202908eaa6fac
font_02_sfnt_off000142bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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