Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a36f78a6cce864…

MALICIOUS

PDF

161.2 KB Created: 2021-06-26 19:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 613c46c794b474b7724368668cd72945 SHA-1: 7c18fb3c35b92158d27b6ccb470f93fbcaeef584 SHA-256: 05a36f78a6cce864c176c6c09034d70e5c723adb9bb511c927ff8475dafd397c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://smidgel.ru/uplcv?utm_term=boiling+point+and+melting+point+of+alcohol
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/dd8ae26ac66b017a966ccada39088d7c/67562995874.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e20088b75e---monewidufepabirofopolekir.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f207eb24a---wijoguxobes.pdf
    • https://pui-vital.ro/msg_media/file/77638977252.pdf
    • https://m-isc.com/userfiles/file/26724731505.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4e1a52bbf---torusitugeji.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/36389563008.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607322e0592d6---76706833515.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02777bc094---39416079563.pdf
    • http://ninda.vn/userfiles/files/42508130231.pdf
    • http://www.motorradfreunde-toggenburg.ch/up/files/84377655547.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088dcf436fec---62723900198.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/50a069ca2ec569660db5c11c5fc23719/duligowufefiramugazedefez.pdf
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/33897895813.pdf
    • http://newbusan.net/FileData/ckfinder/files/20210625_4AE2EF92205F3CAD.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c77c0e7a2---54240699652.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084062c8377e---dolebemuzakuvixixodozagom.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62955bf421---pikutevex.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d3bfeabc33eb5ce86ba3a4f4206e8968/padodozizetamij.pdf
    • http://gramercy-grand.ru/files/file/teguwaledax.pdf
    • https://empezo.xyz/js/ckfinder/userfiles/files/vomonovojoxidula.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/oalsfehlm3ltvd1fg4hfg5l137/59959194848.pdf
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/kulowexabefivezeg.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/83dffcfcda63455520b52f2cb72b109c/40203458485.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_off00020867.bin
6c6e75462e8e6302e4bc30185d09a2fdd0770be2697f276a0a9291eaca0845bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x20867 10852 bytes
font_01_sfnt_off0002210b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2210B 16792 bytes
font_02_sfnt_off0002391d.bin
c517c813fffc5e7eb5a71da7f0d923c1e6795922be0736f57356b32f24fccaa7
pdf-font-stream PDF embedded font (sfnt) at offset 0x2391D 24540 bytes