Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d73b7574e1ad9a…

MALICIOUS

PDF

88.3 KB Created: 2021-09-17 06:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1a2c61f2b1bd4df5850a5065657b5b2 SHA-1: 4098f3ca49cd020755b164c7364d3580e45b3694 SHA-256: 04d73b7574e1ad9a09c9088ae85a93559fa8291a9086789122f47166b71dda84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external websites, some of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://srmtteaparty.com/uploads/files/202109110225456742.pdf
    • https://bizimpin.com/calisma2/files/uploads/3334872763.pdf
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/9407583081.pdf
    • http://ciskmv.com/css/file/xuwesokukusepaxa.pdf
    • http://elsped.hu/files/file/voxuruxuroga.pdf
    • https://living-stone.lu/userfiles/files/21550295094.pdf
    • http://dent-pro.cz/pic/file/rutav.pdf
    • http://albertopizzetti.it/userfiles/files/xavuzinolarawidanijipuri.pdf
    • http://silverspringabw.com/uploads/files/37399258744.pdf
    • https://phukienbep.net/media/files/27516229280.pdf
    • https://suma.ca/upload/editor/file/mebenesetuvibob.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8e20e665737203204eabd0e1ba2a46c0/7720940077.pdf
    • http://f-okinawa.com/img/tmp/file/fapeberufotawepiwu.pdf
    • http://35ct1.com/images/ckImageFiles/files/78205823929.pdf
    • http://youngthisyear.com/ckfinder/userfiles/files/segalomaba.pdf
    • https://dichvuketoanvn.org/uploads/files/fojadarizizula.pdf
    • http://modernplating.com/userfiles/file/wanorize.pdf
    • http://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/30183938608.pdf
    • https://aedwea.com/upload/foto/fizudola.pdf
    • https://silatur.com/js/ckfinder/userfiles/files/togasulavuju.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7n3lmpavcnhghv6k6v6s5ti1g3/81092499024.pdf
    • https://karinbentum.nl/uploads/file/kewovipegawotofupo.pdf
    • https://nawaasha.org/userfiles/file/tobod.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b56dc770da8bad65606d579f2e432302/zobazeroweg.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=asterix+conquers+rome+pdf
    • 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_off0000f018.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 16792 bytes
font_01_sfnt_off0001082a.bin
8fcd5e417ced17856aa9c5c94ca1b37ce62174c358744908aa6b16a270f4692e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 19316 bytes
font_02_sfnt_off00013a76.bin
5485d234d39d9cacb9f5c542e8f95f9bf2d3761276b2da99de25a120edb078bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A76 10904 bytes