Malicious PDF — malware analysis report

Static analysis result for SHA-256 037d24204646a6b6…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 01:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 442ae9c21ee33926a1b723fb25c32b85 SHA-1: 663a7536d134c06e7ab7dfcebeaa5eccdb373748 SHA-256: 037d24204646a6b6fc57d1fa03100bde1050e39c476cbc397aa552426d354756
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, with the apparent goal of tricking users into downloading malicious files. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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 http://35ct1.com/images/ckImageFiles/files/99140633321.pdf In PDF document text
    • https://cuatudongnhatrang.com/uploads/files/kisup.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/rabupugoxojelogijod.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/jidiwowonozopilonija.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/25647395231.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/pogisutoleg.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/9506820798.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/q3unblaqmkem802dikbd86o80n/masukomumufiduliru.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/kudozisosufaxupijufesos.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/65834468625.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/vajunaxe.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/gedujar.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4e83579a4---renewi.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/58618952215.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/76849571832.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/98332165837.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/gigufi.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/42220527234.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8e59a93b7---bilikunovudowogizotewaz.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/87487868862.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/34090509489.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/bolirusipodumomef.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/rizadosuwebefesawulakif.pdfIn PDF document text
    • https://podimercrm.com/img/files/2770931821.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/32743909449.pdfIn PDF document text
    • http://renknh.com/ckupload/files/85475879919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+live+football+app+apkPDF 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_off0000da20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 17792 bytes
SHA-256: f209dbc526ba8bab78bee0678ff78537433ea4ac3cccb46269e1579687b8673d
font_01_sfnt_off000108d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 10608 bytes
SHA-256: ed809cccfb7bafde553159a4a5532c6dbcf104b67c5a8cb212b6f026544cd49d
font_02_sfnt_off000120fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1