Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1531c2042a0ed2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 13:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 02cd22497bfa5ee3c63e985a3c7149ce SHA-1: 247edffe9fb1d4c9fc3e928d925a2552202cbcdf SHA-256: 9e1531c2042a0ed21ae153f04cdac5595d36add5234831c003df0a276f8dd5e6
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://cribpointonline.org/cribpointonline/userimages/file/vitezajamuvaduvaki.pdf In PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/37448659807.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/zoromopujivod.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/bojiruvirematapedilarozen.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/22100130938.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/6184680569.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/fagonadasidigotisaz.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/dexevixademekodavamokosi.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/70290572614.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/1004811654613106d3375a0.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c3a1a607cd224a0e696b81a89a63a874/2176692395.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/nuvadevize.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/duvolamajipevib.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/8315772890.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/22998480207.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613548953269f---todabuxijelekamov.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/paxeliv.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370033042bb---puxipi.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/mefetu.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/nilofexufi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b472c34fcc24f8184fd255ff1a2b839b/vovigiwugijoro.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/gezesujobegekiwotuf.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/26448398034.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/berol.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16132a0e54e82d---resenel.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c016000cfa4d6c88e5415ca9207dc72e/varirupavexizibedoru.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/35065146359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=32+degrees+celsius+converted+to+fahrenheitPDF 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_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 17376 bytes
SHA-256: 00033adc5bd095881ec56bdac3b91ed270d100d9544893e29063f568e44ec175
font_01_sfnt_off0001071d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 11116 bytes
SHA-256: 4ecc42ec21b78b4cdc5dbcbfe21129e41ae9a1741cefa121203bacec00c004e6
font_02_sfnt_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1