Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e3b2c148485ab4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 00:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 281fa88d8d8f481a9dada214acbe2331 SHA-1: ae04cbc19b9b49cd64d5ee01e3bf424ec40c4333 SHA-256: b9e3b2c148485ab4c48dc5ace7fd451e2c9700237a63bec54edda61e5515fd08
204 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, impersonating cloud document services to trick users into accessing malicious links. The embedded JavaScript and numerous links to compromised or disposable domains suggest an attempt to download and execute further malicious content, likely a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://izumrud38.com/ckfinder/userfiles/files/zedalopojofu.pdf
    • http://48bulls.com/js/upload/files/78283225806.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c97e09298d---62989423346.pdf
    • https://questyme.com/userfiles/file/82573590915.pdf
    • http://canadianrockies.info/files/file/72377650561.pdf
    • https://ontogepszerviz.hu/editor_up/fivupijebusapuz.pdf
    • http://mictrogiang.com/userfiles/files/texuze.pdf
    • http://nbkhjc.com/uploads/202108/file/210831223026314680egv19n8nikis.pdf
    • http://adamslakeband.org/userfiles/file/51530362253.pdf
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/28634003632.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1593ca6a---44326216662.pdf
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lekixalizix.pdf
    • http://myepres.com/HotelEstimator/userfiles/file/12348858183.pdf
    • https://kudamatsu.org/userfiles/file/figibitiditusuralunon.pdf
    • http://www.gesas.it/media/mailinglist/file/8620930960.pdf
    • http://pokewaveanaheim.com/uploads/files/wepesanagasozonasajegudun.pdf
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/regojilajiwuz.pdf
    • http://etcpremium.com/userfiles/files/wudulim.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b7f282707---ruludi.pdf
    • http://zulassung4you.de/bilder/file/96774768487.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161420280e22bc---78314928791.pdf
    • http://greenglobepms.com/uploads/xujiti.pdf
    • http://msinziniering.com/userfiles/file/77035328979.pdf
    • http://wieswioska.pl/userfiles/file/tufakedokudatimo.pdf
    • http://mevlanaasm.com/resimler/files/kitojaketuxegikusivikixas.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=o365+mail+portal
    • 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_off0000dca9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 16792 bytes
font_01_sfnt_off0000f4bb.bin
dd9038888cd8a4a3db289d5d32e508c56870c6ab94207fd62be3aa4aec7c5c1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 18148 bytes
font_02_sfnt_off0001241c.bin
d6d237cd71066c75c3504ad5d0f2914ed19a0e2408e4316fc6b6adf0cbf7ff5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 10508 bytes

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