Malicious PDF — malware analysis report

Static analysis result for SHA-256 da572797316aeaf1…

MALICIOUS

PDF

72.0 KB Created: 2021-09-09 13:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea31117d168586d70d1c9e17cb14805a SHA-1: 2b932c3fbf77cd5747caf6b70364327c247b57d2 SHA-256: da572797316aeaf1a308c30c93b90512990682da4a98e17c2afa852f7891533c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.studioline.ie/ckfinder/userfiles/files/katuvuteza.pdf In PDF document text
    • http://rencontres-icare.org/userfiles/file/28009767124.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/tabigivozotukidoxukawoku.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/8a70e613c360e645a77c1a8b685be4e3/puzaded.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1296cf76---tarewugofeniki.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/44889050619.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109020542473990.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/tiparitojolad.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/69514318555.pdfIn PDF document text
    • http://villkasz.hu/editor_up/pamukirutupusasetu.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/59245581285.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/peredasagiro.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/loxopurup.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/98398412686.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613176b5a35f9---kebepipumupa.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1dde48d8787fb8e1b3609cf1334dfdf9/38468286057.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/81259616036.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/jojinot.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/jefipuxiwunofogosu.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630530825_2ad848a803.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/wufadu.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/fubimerikosuba.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/tuxotogodibiwofej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bully+ae+apkPDF 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_off0000bab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 9924 bytes
SHA-256: e3214a4a5b45e15570c3c431c90213b5686bc3361759aaf0addc706b5ff66dae
font_02_sfnt_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 16164 bytes
SHA-256: 391f78b80e86de2c1013db83a377528036e5a730ee76f54e87be86f33b29e051