Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a287cada3e3264…

MALICIOUS

PDF

96.6 KB Created: 2021-07-17 00:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1863a6c2b35ccc300bfa3cc2f3e48faa SHA-1: 5ecc5225ca731c52bbe2b5a70e18bab0a410290d SHA-256: e3a287cada3e326494150c71a7b657e444f2730408019995d457fe3a8433e410
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 http://brmxn.com/userfiles/file/20210609113112_9r8pt3.pdf In PDF document text
    • http://4998horo.gmmwireless.com/contents/files/87358980215.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/546b92f97dde6209ae13cdaecb233c1a/zavepejax.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/lalaponubifejegisefiweli.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/6542be0712cf5656c936e45798db5698/5269567374.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/eepj4elkraagto6s9u4l6c2bb0/lalosiwawezofodepidage.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d56b8ea8a---3797999342.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95c303bcfe---zalawe.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaec4ae94c---solivosufamo.pdfIn PDF document text
    • https://peterdegendt.be/file/87534170704.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f038338c005---vugudugididarifexe.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/vofalubusobunapipumovatu.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47ce2d826---gikatowewopogovozi.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/01f3m5o9pgghf7e0ha95qfsh3v/jibigavi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f6b18a257---79445568731.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/9235919441.pdfIn PDF document text
    • http://ranagro.com/files/bigotadeburew.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef34715fb4---11577779315.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a48ccca88da---48578336399.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/41762924531.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc11695f206---16547730057.pdfIn PDF document text
    • http://www.buildonhope.org/file/kukomipexevafewufimaf.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8052644022---zuzutidevupipovajuv.pdfIn PDF document text
    • https://pindimana.in/uploads/file/67218756634.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/ba9d2996d0b2f3b3bd3aec9babc3c5f0/sumakajokozokiluvozid.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/12310471047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=icy+veins+fire+mage+talentsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001018d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001199e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199E 16400 bytes
SHA-256: b4c78cc6e5c2960eab4c85e13f7ceeee32fbf3afecd474ad803e35c5d6624684
font_02_sfnt_off00013022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13022 16868 bytes
SHA-256: 2321ce893e4bcae4ee278ffd376ee934ebc643835a5b8ff9db80fb44f7d96d10
font_03_sfnt_off00015c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C12 10688 bytes
SHA-256: 568f01042703bd54a6e67b679bb4e3ba2320693f06279b498061c590e33a5e31

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