Malicious PDF — malware analysis report

Static analysis result for SHA-256 da57626a12b5eb7d…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 05:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1ff354ae0cb0413497747c32755db2c SHA-1: ff91cddc6f39ce9c0d9e7677b25740e03fbc63b2 SHA-256: da57626a12b5eb7d61f57851861f10e17655c7232e97ac113101805b668d53e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs pointing to compromised websites. The heuristics indicate a link farm strategy, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially facilitating further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=dr+3900+spectrophotometer+manual PDF link annotation
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/2v1b9pf8bt98qfv97vjn73dgb5/zozemudoj.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/3b528bcfa4a09d3bf2dc405feb7a4dff/jukobitururagi.pdfIn PDF document text
    • http://hasyo.net/files/file/5349052928.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ed6dda365a3---walaxuraperodakizibe.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/veketolizesalulese.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f1e531734a7---36157119179.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/e494082879dc8aa41af4cad12922c343/kulotubajigukedodupar.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/64560605682.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/19bc7264e1932fbda798ba40e45bc72d/rosisawamatinugoresupisos.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/zaperemusugorobibu.pdfIn PDF document text
    • https://maclashoes.it/file/51827362461.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/wexajuj.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c44ca1c700b---mutetati.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/73390919983.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fe0e01344e5---wexat.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1520350b76412cf8e6b862fc94f2b289/nabanexobebewuja.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161341d43c3046---mafoxududedasokezir.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/42877618225.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/pedamuka.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/daxuvawetekiwezese.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/54846528702.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/96e259bcc1a03006d9c8d326235ccae4/jinujuzipipojufepibarafem.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/loniwemujanosivegudan.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160868b99b9725---78914768000.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/lodavorej.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_off0000bf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 11108 bytes
SHA-256: a8999f894f92ae35ae6749b37c28d694977fb980c703e4aaa2f43846c6a7aa93
font_02_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 17536 bytes
SHA-256: 94e0d2f1bb6f7d33031f67c219a12cab1dd0ab41392c5450f148f228b3aea62b

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