Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1364cbb70553c4e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-05 01:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4655e4c47ba0d767fa37025356611ab1 SHA-1: b86ca40ce6e99e9f99e4985da7daaecd73ca5958 SHA-256: c1364cbb70553c4e233ce20612fae5b1735c68661db314c11911e6a8322b365a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing activities. The presence of multiple links on disposable or compromised hosting suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://aiswaryamatrimonials.com/fck_uploads/file/madejolit.pdf In PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/8asqp9mjs1mbtubddenrnn2uv7/69290496556.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084702db8dba---saxoget.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/l1arufuembq8inbutiqv1hdcp6/jipedowada.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/repexajibonuzokegufuse.pdfIn PDF document text
    • http://www.heksan.com.pl/file/majibuvitorafu.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/gefim.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/xevibodavalo.pdfIn PDF document text
    • http://erdbau-rauch.at/fugibofofamusesinimipuf.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/kemotugatepev.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/karebuxaz.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/dawanemiremumimoredi.pdfIn PDF document text
    • http://accronline.com/userfiles/file/tutogulufemajogiwofilijov.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/7867876076.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/91969600127.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/7696054200.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/zijeguma.pdfIn PDF document text
    • http://mobitransjogja.com/files/fulufewinukaxutiviro.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/nozezoporeseto.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a05560e4ab4---sidurevunofuputilemu.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/topigapexid.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/373b0468ec41fee9cd15577748cb6f5e/84745399231.pdfIn PDF document text
    • http://hongdacable.com/d/files/49612882861.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/powemugajuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pf+return+form+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_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 18648 bytes
SHA-256: 049258372e2f07c898461575da692bdafce263f81c6524fb21ef11fa2a77773b
font_01_sfnt_off000114b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B8 10292 bytes
SHA-256: db6c26956af54cb321bf940bf3cc4d4157ec18ad8dd7f017c7bac19a3ce256c5
font_02_sfnt_off00012bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1