Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66ced119077a41d…

MALICIOUS

PDF

83.4 KB Created: 2021-07-13 04:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 735fe03715becc741a00b4c4dafeacde SHA-1: 3c614ddc50e7d81960f9a3439f331366a0bf3c66 SHA-256: e66ced119077a41d19d834430b1d8736b62cdd4f9e0d9199dce3a22240cb2689
164 Risk Score

Malware Insights

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

The sample is a malicious PDF, as indicated by ClamAV and ML detection. It contains embedded JavaScript and a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the links are designed for SEO manipulation, potentially to obscure the true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://archism.ru/uplcv?utm_term=business+funding+request+letter+sample PDF link annotation
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/914bef82122df97e05d76d30346098da/sifefevopodamovir.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/49764936355.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210625210908_horg6v.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/ferofumagekuledepaleji.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/4537737995.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/fc040d613e1bfdba9c860f48fc19c444/55871760094.pdfIn PDF document text
    • http://gospelinamerica.com/clients/874377/File/wogamibibogakafekezubuxi.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/tigik.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/baboranonujop.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/56949259414.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/58354391488.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/68743f93f39bf088608bcd7a0ffb4cef/tejufobum.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/53478912328.pdfIn PDF document text
    • http://dzbnf.com/upload/file///jomabirakut.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a346176c1a---4793680229.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/81548415795.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/losifi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9346d7ae94---20894306113.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/904ae4db564eb5bd386e217de7ecc3f7/12576565981.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/86433be3eadc35421be1fa449322e295/soramere.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/sobudowamanulopof.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9db70fe72---zetelezonulaludagub.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 16688 bytes
SHA-256: 273dccc010c23351b924dbf14ad39a8f6a1913992381d77f4e0eb5a3e54ee9b4
font_02_sfnt_off0001275e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275E 11020 bytes
SHA-256: ff869299ecd3ef3da3a11f34aa11fa9f66eb2f8c231ee54699eeac8354180e58

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