Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5bf36fd0a70be8…

MALICIOUS

PDF

84.3 KB Created: 2021-07-19 15:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6173ba4d4fa99c8b350ebfb4f82e088 SHA-1: e2d457afe58859d98559b5469f0942c9ee68d50d SHA-256: dc5bf36fd0a70be8db8082cc4c3d9e368f65635d2d69ea8f90d9167f9abf028c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lawrenceyezersky.com/userfiles/file/74764340327.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084c920aadb2---wujarazepirameno.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/886682cea6f16ef83c23a0352c0fb14b/1607185255.pdf
    • https://maintogelonline.info/contents//files/fobulekuwurixekunomebeki.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160771dd2e1d3d---razufuxibe.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/i1rec38qsag1smkjogbv62ivat/12673705999.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8ad37896ae19f89deaf1ac1cc82be0c4/4643543464.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3e4fe8d7b972500ff680113a5dfc8660/53945614620.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6edda9ab---pomalidanurupud.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/69405992415.pdf
    • http://xdata.pl/app/webroot/img/ckf/files/sopefananirovoge.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/92955952753ff4e754f3da3e179afeb5/29259273128.pdf
    • http://yule-sign.com/upload/editor/file/20210717082903.pdf
    • http://acecaalcoy.com/userfiles/file/zijatipebosivuvel.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092589d8ada8---54442895313.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/121f010413d2282452e246e279221330/94583078339.pdf
    • http://liyangah.com/Upload/file/jeminotodikisewitise.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/cbkh9hmuiif91pjsds1bqe312i/pokopaf.pdf
    • https://vntdc.com/upload/fck/file/dozawoxux.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1cfdf4170---jajusemovus.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/24644850138.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765f7601c8f---1569367778.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/b1b08988889d8487c0ce9e66ccb65ebf/tosubozepa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=fee+simple+absolute+definition
    • 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_off0000e533.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE533 16792 bytes
font_01_sfnt_off0000fd4a.bin
aa0ff794c08eadfe008b6251592c5b52b82f35003041ca31d813129ca04fde48
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 10776 bytes
font_02_sfnt_off000115d3.bin
f92c62bdf6578ebf9ae0373854d63cae6566c4e12435936c955e20e5f59f1b19
pdf-font-stream PDF embedded font (sfnt) at offset 0x115D3 17504 bytes