Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c87b1a8f70f753…

MALICIOUS

PDF

85.9 KB Created: 2021-07-15 12:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb81af6041ddec04dc4ffaf5e3a809d0 SHA-1: 014cdbfc6e8d938f38512569edb93aa45853bf0e SHA-256: 84c87b1a8f70f7532637f1416c93d219fe2310c8d1ef4c68a4806b425ce11c5e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites. These sites appear to be hosting further malicious PDF files, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ce70dc2a---fixomusepifo.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/761493fb85e3db3f4b8ef48e77a1379d/peperefazeko.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47755b58cf---85013553670.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60e1931ddf---47839330572.pdf
    • https://aimhc.com/userfiles/file/32742243661.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738ac584521---66203759761.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/nvqn71g6qk920k8uuoc69roo41/rezarop.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160837ada6fbf2---68349024028.pdf
    • http://afghansolar.com/userfiles/file/fimajenepusitoxede.pdf
    • https://calendarsunrooms.com/userfiles/files/81183505555.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/e8e8b996f3fc8384a6fd4fb676315239/dutovefo.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160823be15ad55---49281776680.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/aljdihrojorfsv8p6j9ed4j8va/degebuzimujajid.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160897bad29937---konikibezanok.pdf
    • http://getem.eu/files/file/texoxegovoretupifawiv.pdf
    • http://bkairconditioner.com/uploads/files/monefiwirojade.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1e24b3e9b---vabowiroburi.pdf
    • https://churchofgodinjamaica.org/app/webroot/files/37947963201.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072f25ce02de---bifovuzomikugi.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097cb2d94b2f---88625675818.pdf
    • http://aelma.com/sites/default/userfiles/file/57789412429.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/94367bd2e7a3d283e92216d6693956c7/sanuvuge.pdf
    • http://dintainoodle.com/uploads/files/82939003907.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b7a10c40d31237a0d60c6e3ab533c170/bapoxuzigizon.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=question+for+math+with+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 16792 bytes
font_01_sfnt_off000102c7.bin
c5f07c2208110d52ca9fa0ede95fc7c2bf155e238d97490f9b113893895ea62d
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 18052 bytes
font_02_sfnt_off00013224.bin
e2298eeb0d57fe80ba0302f301197a64b83e3469e282e85ff10f1683aba49f8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13224 10680 bytes