Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1ad394b6b65686…

MALICIOUS

PDF

88.5 KB Created: 2021-07-02 21:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8410bdf6f5e6be44a46ca8457fe76b2 SHA-1: 072930a64700ffc903ead4e07e4265c8d9bbe46b SHA-256: 0f1ad394b6b65686ee93407edeed7a77e98e978187198b491208b0b20482f50a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://betibg.eu/webroot/img/files/85547014273.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b421653a256---razitegodezufutu.pdf
    • http://b-solutions.net/userfiles/file/49962531312.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c78212625---18995396547.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f58696a79---33430515758.pdf
    • http://banghetretunhien.com/media/ftp/file/kidinawoxix.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6cravam1g2nd3mliusc71a720g/65792959749.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/c79b12e0fa1544c2338cbba1e970194a/faxiwapizivewasiwumuvud.pdf
    • http://accu-chek-event.com/ckupload/files/16109097587.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f3dd96acf---zujizonozowofobu.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a16f11ee9f---19964605210.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609e036c15af5---62843716946.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3eda3b4704a2af67e8ed88eeec68b45/loronukibiri.pdf
    • http://lafenicealcamo.it/userfiles/files/tapaxul.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/fowisinunule.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16086e4518aabf---44146859463.pdf
    • https://vicotelecom.vn/static/source/images/file/setaposojod.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790c659d82d---82707528945.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a39cbdc94---viwez.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50c18abc1f---10319296347.pdf
    • https://contactfm.be/userfiles/files/nenogofu.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607486cf0f057---durapubawubasasadibatat.pdf
    • https://west-holding.com/userfiles/file/25521705923.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0091fc3c5c---wuwaxodiseligesaxoz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hold+a+candle+to+origin
    • 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_off0000efcf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 16792 bytes
font_01_sfnt_off000107e1.bin
8d61a4efb5149e22ec19cf65506f93d87e9656c9bcc2267b2cc66605af3b2870		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E1 20228 bytes
font_02_sfnt_off00013bc2.bin
3c5622e81f044c5f11df7a8fdd2bb24e8f7a8e5f738a8ad41260396e056829b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC2 10368 bytes

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