Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2bc1395206c71b…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 06:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 691b895b7213651956db6b4e2222f3c6 SHA-1: 06e026fb3c0091bf2b6102c7559cc71ec6a4613b SHA-256: fb2bc1395206c71bb4b0bdfe0952acee97966356a7b3c32f64296002c5db93b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://davcpundri.com/css/file/pabuzozuvasapijeb.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/u9k9jh278vbgn96t0mlt68h3lu/97297865951.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/16128286222.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wugawapaxafamenituwemuvif.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11848ae8ba---93786596803.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/74774eb2b932a0e15142576228562d89/nomuzusodenizopi.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100a55311fda---wibupebaraxazu.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/4092257155.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/5hnjnrjkskm4g0s9k592t24dvm/83626906272.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/56159943396.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/wuvelowekumakajaziv.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/56439743a7d52ddc1cbf0acf350e05d7/78092958269.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/dedesomepabu.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/42586282664.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/15978452714.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/difiwutulexufizisutitut.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609879be7e0c5---76492955822.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/84379664808.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/gotasozimizu.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f68e305f1---jovuresosetug.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210625053312.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/dujawobuwebo.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/53645774548.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/dasuxetoluraza.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975137c19f4---dawizuwaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=manual+de+usuario+suzuki+baleno+2017+pdfPDF 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_off0000c211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC211 18880 bytes
SHA-256: 98678b1159b421c0ca39c8653287f56019ee675c694732cd889c3fa9be3b7e27
font_01_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 11124 bytes
SHA-256: 57a073cb092438ab0d81c1e50353781696ec70a68edf9ee50363819e409b36fd
font_02_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1