Malicious PDF — malware analysis report

Static analysis result for SHA-256 577807a16561fe72…

MALICIOUS

PDF

76.6 KB Created: 2021-09-16 08:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: addb5a09035326345c5f3f5a0a8cf536 SHA-1: 10d7e6592997bc8abf7925450f0416d16b83af2e SHA-256: 577807a16561fe72196148fdf5c8ca1e6d66b693c807fa6b293ab0fc07eb47bd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the compromised CMS upload link heuristic strongly indicate that this PDF is used to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=db+meter+android PDF link annotation
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613349e4cf5b1---dabilinepezujebo.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/64517046137.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/11572643065.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/bj71t9l5ke80vc30ifogqo1n1o/31150736083.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc7f682b1---29052494639.pdfIn PDF document text
    • http://hadt.vn/upload/files/mikasimixebuzafifot.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/rasixunegunapazaleke.pdfIn PDF document text
    • https://panoramabyty.cz/content/masumupujetebo.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/79885057923.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/92440388395.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/77818867239.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/98711315176.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/23621626978.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/26487764214.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/16786036430.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/7672736424.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/35760596941.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/46883463466.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/zepix.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-08-04-13-15-88.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/naxaforu.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/labikaviros.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/golemituvagejawelapa.pdfIn PDF document text
    • http://elitvorota.ru/f/file/zuduxoreku.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/gijefoxevekasamuboxasap.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_off0000c8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 10336 bytes
SHA-256: ba2e5c9c0a632276728ff7157b5919967aaf47ceafe15150190e5fc3ca9b16ae
font_02_sfnt_off0000f80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 17200 bytes
SHA-256: 3588eeee1eea86fa4e91a2993dab484c69a916b31ad94392b605366f3d36c1a2

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