Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b70550da7872474…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 04:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3721d076b00709334de46426c23ff655 SHA-1: 5edfec1e7f183d7e8601111968705f9559d7e85f SHA-256: 1b70550da7872474674395da0da93740223af612f9b5a68e4f7ab8326ffaf166
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it contains embedded JavaScript and links to potentially compromised or disposable hosting sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer. The numerous external links, many hosted on what appear to be compromised WordPress sites, point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://bursakaynak.com/userfiles/file/fetarekizomavewaxoke.pdf In PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16125ae48d89b4---marujevuxatipabalokib.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/defiba.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/papekuvewepa.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777b0c809f2---25161237780.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5098947a66---xufiseremutatujo.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/kosusuruwakamitosef.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/vuputedemike.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/cbcb1192c252f207c91b3c44306a90a7/litatomasak.pdfIn PDF document text
    • https://maisonforville.be/documents/file/begane.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/wumilodigiwapemaja.pdfIn PDF document text
    • https://dineflon.com//files/mipepawetutakef.pdfIn PDF document text
    • https://alariel.be/userfiles/file/vipijonafaturile.pdfIn PDF document text
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/84124847689.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3286c200c---7530297201.pdfIn PDF document text
    • http://kotolantopeni.cz/file/jirulebolojazelodi.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/karebuxaz.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cdc21d3c9---50845241660.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a751f4c72c3---vejofusazelu.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/bisovobivut.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/70909438044.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a56b8fe1f5e---pepusamowavodov.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/jigesujobe.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39816027db---18518560899.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a119ac21d1dc790b57e4085f81364a55/ximogawoguzosilujaluda.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1873a8d52---dewokerafaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=follow+my+leader+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 17216 bytes
SHA-256: f551ee14418de7b30d96041b58341efca7697b49f55d194f5044c28e623b5808
font_01_sfnt_off00011157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11157 10376 bytes
SHA-256: b4e44288a3b2b5964b5e98fbd54b72c62b06b91eaaa8f9ed95c36202a2d98f11
font_02_sfnt_off000128d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1