Malicious PDF — malware analysis report

Static analysis result for SHA-256 123ba57defa083bc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 04:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 322115d017c325130cb87a36e9cf69a2 SHA-1: 25127bcf8ac54eb57945ce1716ae7793b42ede37 SHA-256: 123ba57defa083bc9365058ce7170b438575b8b5aa8089b4a08ac9faa7f6687c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains an embedded JavaScript stream and a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS upload directories. The URLs suggest an attempt to lure users to download further malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/7ca03a11744cf8391db7a84625bebc62/bezub.pdf In PDF document text
    • http://cnpair.com/userfiles/file/gugalusovexojopu.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/mesirofudapeg.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/xozekepud.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/dupimatonetifoda.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/82752776779.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/90118583564.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/16642544601.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/lurobizugepeg.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405bd54ed6d---ramuxukazilokibatevu.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/naxezemebir.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/65571371048.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/temibetutudesegovu.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/didaxeja.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/2780845385.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/55631177196.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/48766608329.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/jemitenaruzizitu.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/vobonepulideseboduxorunu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/gacdqufhpmjo0cis47gct47gh0/balojoduna.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/42995813617.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/bepupejuwogenuvezivu.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/52205642595.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/dufebavuxetotubub.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/0r1t6fl69e44ppll3hg2v3rs8b/64863872546.pdfIn PDF document text
    • https://dintek.eu/uploads/file/venituxetaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=all+in+one+tools+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 18100 bytes
SHA-256: 9f0c6542f3878d6f764b30e289bfd84581ec42e6288aaef16df660ca332589a2
font_02_sfnt_off0001229d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229D 10216 bytes
SHA-256: 6c6876bcb16a502579da946f503ef98ab73f62964c1c1e80bec18fb40fb776be

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