Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a11bf2b22738cf0…

MALICIOUS

PDF

88.5 KB Created: 2021-07-15 18:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf1a9a4808fd5975da100f8d803ce1da SHA-1: 21186ffc614a747d2fde01986552331731a56f45 SHA-256: 7a11bf2b22738cf082f07c0f3e3990231216f3ecc554d1562876a5b684ffe96d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d1395751ff7ae13a4cf3991f70613b49/44271720041.pdf
    • http://vizugy.hu/uploads/files/febofawilelovurupago.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160720fa35165a---ruxadadafuwiravolasedigub.pdf
    • http://halmar.info/userfiles/file/96308485592.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c2d4e3141---pizexuxifegugosobarasalox.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a802c698302---kuzapesemosogupemaziguv.pdf
    • https://atcotourismtravel.com/userfiles/file/zarigupexitefopupibi.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0ef0adb192c4f799b496ddab63e7c59f/nevemozodojonodoxelevipi.pdf
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/fepukovogaw.pdf
    • http://stacjaregeneracja.pl/userfiles/file/jefazajojopike.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2bf617e71---vanikopusuxoje.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b0af4c69c---wupipukow.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be3b3c21b3---nopubowodosikujezobovuxan.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090879bd0fa5---liduromosebipodazasoxavom.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/uoh0gb3cr7j578q02kjep75701/vilojawukaziridewerux.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a636a27977---megegebezojolutop.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3d701c1ef---nisevekavup.pdf
    • https://binhvi.com/upload/files/56704100357.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c956a795f6---71492512289.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092f21d1a265---sogamidudig.pdf
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/gojerexuka.pdf
    • http://budohurtsa.pl/userfiles/file/83150645548.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b194143534---puturejowuvajufetawili.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/9d6a593cf79fb467dd862d743cadc68a/27671294727.pdf
    • http://robwalker.net/fckupload/file/resarutiga.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/rcc1s95qf58d911hkva1dftf45/37686363011.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=badminton+court+line+thickness
    • 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_off0000f74b.bin
ca152da29e7964d8f05fd5ab4835fa2b0a4d87f17ba6bc68c1555e09f0fa1c74
pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 10880 bytes
font_01_sfnt_off0001103c.bin
b0ed4442a3d489ab660cda2f68dfa39c96b8b1b66f94b17b937be1cb01cab167
pdf-font-stream PDF embedded font (sfnt) at offset 0x1103C 17112 bytes
font_02_sfnt_off00013c6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6C 16792 bytes