Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8158d034141ba8…

MALICIOUS

PDF

91.6 KB Created: 2021-09-01 11:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 62261c755b07ab0d339abf5ff3f5e5ed SHA-1: ddb357c70ea1132fd297b0ca3b08c1640bfb4fc4 SHA-256: fc8158d034141ba876fc1204bed3fda8c7b05778f334ff885f5bd258018edc69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=funny+trivia+questions+and+answers+printable PDF link annotation
    • http://poltinik.ru/userfiles/file/jowubajomowuwitifowunuw.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/xisofebuxufivojatatak.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/tewupaxobag.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ceb468fd---lomosawup.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16073f4c7ccbeb---rumezedanamutilujip.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/fivunu.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/38255289613.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/592d1d782614610912213e45a5a947b8/92450320985.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/28417267726.pdfIn PDF document text
    • https://wrd13.com/force/file/zudetemugulukudapadukasez.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/podopagogawuvina.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/dunofofilalolusediv.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/27443689235.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd77a70c35---menutaligiwotoxekekalone.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cc4010c7655bbe55be235fb34ac4b0c/90296682752.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/jasodufitunelof.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160729562e7c03---36536248879.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/25786409566.pdfIn PDF document text
    • https://ghnservizi.com/file/37816843001.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/47739036760.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/lomoxajovasimudopeba.pdfIn PDF document text
    • http://timapools.com/uploads/files/49252011536.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/wibuf.pdfIn PDF document text
    • 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
stream_006_off0000fb61.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFB61 18324 bytes
SHA-256: 5d252e24ffccbb1b78af0459b48519c34e859d22e1aa34ed709d9c4fd480f24f
font_00_sfnt_off0000e211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 11016 bytes
SHA-256: 26189526dbe380a5adc14cfb504c3ec24cd1cdc9ccd7b2e4fef2828c2663aaa5
font_02_sfnt_off000118a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000130b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 18040 bytes
SHA-256: 32db30a71e95189178fb155358cd1f7ab8e4b31fb9bf4805edb0963a9b4a0b42

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