Malicious PDF — malware analysis report

Static analysis result for SHA-256 1daa1f7df94ebc23…

MALICIOUS

PDF

87.3 KB Created: 2021-08-06 04:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cade1d68482d7e306a849d73793a7d5a SHA-1: 1ebe5761fb8e3498d60099dbf7924b69b57d8db6 SHA-256: 1daa1f7df94ebc233238ebaed655dab813eaf4c22a68e2d0e43d3cec3b5d4c6e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS upload directories or disposable hosting. These URLs likely serve as a link farm to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/uplcv?utm_term=ejemplo+de+guion+de+obra+de+teatro PDF link annotation
    • https://bangprice.com/bangprice.com/beta/cms_image/file/39657051134.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aa7d80b49---xurawibilirojujexon.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2eeea9bee28d9b7d3a71963c380b9f1b/sufosudetixegukemamuraf.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/jekunudewubi.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6db0156f2---21533364618.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t3m5csupjdos2drisblp896nn0/62551576537.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/77436599091.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/56398215775.pdfIn PDF document text
    • http://hnatiukreunion.com/clients/b/b5/b5561851e3069b632e798ef7a1275556/File/xirozuzobameve.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b81891b7ca6---nikapuzuf.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/nimabef.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/nidazojox.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec25c425b---61447618703.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/ab734896495acea65e5904951590d394/begewukowogokesod.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/82440567833.pdfIn PDF document text
    • http://ubest.ru/images/file/siradogiz.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba5b67cd6---zobamo.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/rixip.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/xabojuwog.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/71633002675.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/8fabd39066126c7c98392421bf9a71e9/sepisofutega.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d89aaa995---76125239534.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/10989b01d70ec3200879ecc0711c1f59/noniliwisavokal.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_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 18012 bytes
SHA-256: cab4c402e0af3f52d4e0edb0d5248d979c14b50fa6f82d5d85e55c84715ea46a
font_01_sfnt_off00011cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13509 10920 bytes
SHA-256: 5df8c370fdfc2e2dc8fd03cd57587a1d4d13e913f2e640a580461f8a9700e5f5

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