Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0a5279dbc16348…

MALICIOUS

PDF

68.6 KB Created: 2021-09-21 06:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a6de18e8231d401307f193a1273f7b98 SHA-1: 386634273941422d9c81c0c6ca783e22eeaf8e3f SHA-256: fb0a5279dbc16348afa8b1cae3ee82144ac1fc8ee9685d5a057392eef67d2379
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

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 https://pixomot.ru/uplcv?utm_term=tom+and+jerry+2021+watch+online PDF link annotation
    • https://mollis.rs/files/jojijajasuzudez.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb0377cf7f---1664491974.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/nilejaturunikidemalor.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/46075693648.pdfIn PDF document text
    • http://sasalidayanisma.org/uploads/file/436040624.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/revaruke.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/wukafadunefizenot.pdfIn PDF document text
    • http://feminella.ro/upload/fck/nojagiji.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16144a4f27c160---pujidetirijexemi.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/82457248999.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/17029326065.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320c5c5c208---sozopipiwubotep.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/gefavawitilerufanosipof.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/vudonuzuraxoxurugonabudik.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/fawibodejidov.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/lufunirejepiw.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed24874d41---83414268844.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/rifofat.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/vatujelitonogowodorikok.pdfIn PDF document text
    • http://surtek.biz/image/files/20150320_124340.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/52142999633.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_off0000aec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC0 11052 bytes
SHA-256: b09e5ac58a5113aaa4a4035b1d4fb3978dec3256003aca5c3282fe61529bf315
font_01_sfnt_off0000c861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC861 14628 bytes
SHA-256: e06ac27d1257db18dc2a5ac97f995d0e608c48a6bcb30b8a5d9478d2d2927fab
font_02_sfnt_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1