Malicious PDF — malware analysis report

Static analysis result for SHA-256 99dac942b4132b55…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 03:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb32a66d8b4abc88a30cf82a076ee384 SHA-1: 946437fdc95a55e5d01ae084e1ac9f89bb42deb7 SHA-256: 99dac942b4132b5569d284e442ce2f6617c15dfa223a5c3500b807fa196d4319
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit vulnerabilities. The presence of multiple external URIs and link farms points towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160708c3097093---58630118000.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073253c1f8cd---lajovunejif.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9892fdec20---kerarubupopefisosekel.pdf
    • http://ahxxzx.com/userfiles/202106/file/nufifepis.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089046e7a710---41973676303.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb0fd62ed9---23213959039.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b536d39e4656307224c69b9ea1a36d2a/larewafinuduju.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd799878d9---44266241313.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1f27c4cf1a84e6195d58f048990979a6/59991701359.pdf
    • https://swift-tw.com/lcc/upload/files/29615595294.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160824ba01ecd7---12402001786.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/41230077321.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u7rm8pqvdn5nfehtdhth2spfl3/80195940228.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/a407b3e72f20de4e07a29e0e4b6caacb/63534338796.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b40f1e584---94819128720.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c6eea5b98---vupazujazegewopagixuzaru.pdf
    • http://botosani.ro/img/uploads/file/wobowebof.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/7c08167fa9263b059d85e5cb979d8668/pogeritilegonadolisaveku.pdf
    • https://cornerstonelaw.eu/userfiles//file/bifag.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096c9e17961d---vujukefur.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b48d0d67af96ca633993a35751abc3f5/wosipegimud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=honeywell+thermostat+manual+th8320
    • 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_off0000f215.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 16792 bytes
font_01_sfnt_off00010a2c.bin
7306db4b927c3a38127fd297848cfc6d7963dc870523470b89771c95655bf766
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 11196 bytes
font_02_sfnt_off00012455.bin
343c794890a20d35a358ca4df417863a530d9dae61ab696747348d86495a0160
pdf-font-stream PDF embedded font (sfnt) at offset 0x12455 16888 bytes