Malicious PDF — malware analysis report

Static analysis result for SHA-256 321bc0dca81cfca1…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 10:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 49328523a8cd107e60a0a46a41db7739 SHA-1: bd8fc5d140e3a8e553d50f8099d11402fc671566 SHA-256: 321bc0dca81cfca15747da5f4a3e769bf7d6fc114d81a33e4e9c427a7eb5afc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest the PDF is likely a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=encyclopedic+dictionary+pdf PDF link annotation
    • http://ttlh.vn/storage/ckfinder/files/kinupasutetafegilemaketo.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/56170137593.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210820_3256B5187233885C.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/xafitezaneliguf.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5b73d234a---87908340447.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608348bd773c5---98267841235.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a49f47ed40f---78887014055.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a75df5f0ee5416ef64e5aadf4d02ae28/joforatokupokusejupu.pdfIn PDF document text
    • https://asiapharma.la/files/files/kikuxuligesibod.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe47a53602---segofekonepesob.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/14210133952.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/votuvakufu.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/zugeduzugasopad.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/80bf36515f70f8ff613c1331834b1075/gimuk.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/magelukalomater.pdfIn PDF document text
    • http://efrex.cz/files/file/37335412061.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/9731228374.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c09155bd63cac3504cd1d5e95e8a9a78/1401732010.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/65c048f95dc2d61022f9880efeb42eae/58162508870.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/nufodavomukes.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/mufiwonasefegivugubosumip.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607960633c8fb---zofelujofitezotonuso.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/dakizurakekopabenaj.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/71910214142.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607effe6c121d---kamafeneramu.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_off0000df90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 20488 bytes
SHA-256: dde78b3f7851c54ace18184f59bddeb2d5860f7685fa5c65c74beb4a03183451
font_02_sfnt_off00012ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD6 10544 bytes
SHA-256: 67ee1089f2d6cfcc219c19fb1111bcde95e9813bb2ae7f990b7f76347be53a12

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