Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d9fc236f5b051a…

MALICIOUS

PDF

82.4 KB Created: 2021-08-14 06:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be3b94006ba621083d382cd0481216ae SHA-1: 3f07d4229539e9f6f50c178f768c60c145a0e8f1 SHA-256: b5d9fc236f5b051a4ffbf77a727d764073110eae2c9e84668a68f05fab90161c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that 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 for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crysiq.ru/uplcv?utm_term=adding+fractions+with+same+denominator+pdf PDF link annotation
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a84617c1535---fakilakibudixigevizapaz.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/vuxovez.pdfIn PDF document text
    • https://strechybenesov.cz/content/70248013576.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075de52d9b71---1567445909.pdfIn PDF document text
    • https://meccanicagambirasio.it/file/vejuwevut.pdfIn PDF document text
    • https://angkalaris.com/contents//files/45244691622.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/falenilodikarageko.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/61e4vmdgs53r7kfvtqdicqmu0j/karejopan.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/sp8i8ghm0v5bth9g8vhbcvq3l2/nimifodelusotibejo.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/tuloropolusi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6fba6f4bb---muwabikoz.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/kenatorumubilotomurevog.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/24015508852.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/43118211397.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/3cbf3bf65d4865d19ea149155de8f4fd/jamub.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160947324f2242---43459679542.pdfIn PDF document text
    • https://rockoncharters.net/home/rock/public_html/ckfinder/userfiles/files/zemutetimowekamodexawude.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7edab46075---19683688424.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/devuxomifugaforipekiw.pdfIn PDF document text
    • http://xzass.org/ckfinder/userfiles/files/4729627954.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/23230825762.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160de3b8f12155---54725655413.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/93816693376.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_off0000dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 11088 bytes
SHA-256: 85d200d80c8d19d57a01089d47967817aa97f3d59207ce4d01e02e3ad73068be
font_01_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 17380 bytes
SHA-256: e09448ad3e81f2d550124669235e7edea88ffa2dc600715becec49a518f6f5bb
font_02_sfnt_off0001238c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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